ok, to preface, this post turned out much longer than I thought. Feel free to stop reading after the alchemy info if you aren't interested in hearing me talk shaman/warlock talents.
So I just took the time (after gathering some herbs in Outland) to raise my alchemy up on my shaman. The cost is pretty steep for vials (3g for 5 imbued vials, but take off 30s if you're honored with the vendor) but a lot of the stuff is potent, and that's just off the trainer in Thrallmar. I learned easy to make +15 all stats, +60 AP, +35 str, +50 healing power, +24 spell power and +24 spell crit rating (almost 2% at 60) elixirs, and higher-level major health/mana pots. The higher level majors are kind of a ripoff, because of the cost compared to making regular major health/mana pots (they restore the exact same amount). But the elixirs? They're awesome.
Higher level herbs in Outland also give some nice stuff if you pick them. For example, Dreaming Glory (or something like that, requires 325 herbalism) gives a 30 hp/5 for 15 min. buff just for successfully picking it. hp/5 sucks as a stat for itemization, but mostly because you can never get 30 hp/5 from a single buff. That's a REALLY nice little buff to have while grinding, especially for anyone who melees.
And IMO, final judgment on enhance shaman: Go 0/40/21. Shamanistic rage just isn't as useful as NS even if you somehow had like, 6k AP. Even the enhance version of t4 has +spell damage/healing on it (in addition to crit/hit rating and loads of str/stam/int, so it's a DAMN good itemized set) so NS is not wasted going enhance. Resto is really nice for 5 mans with a priest/resto druid though. The druid can just stick in tree form and rejuv/regrowth (yes, it's castable in tree form) and swiftmend and you'll basically earth shield the tank, water shield yourself and that's it (feel free to jump in and melee the tank or MA's target and get some mana regen from water shield). The 3 instance runs I've had where there was another healer with me, ALL we had to do was hots + earth shield to keep the party topped off in every normal encounter. Yes, we had to heal for the bosses, but who wouldn't?
I absolutely love the new 5 mans in the expansion. Maybe it's just because those are my favorite type of dungeons - no need for massive people, and nearly any combination of 5 can do it as long as you've got a tank and a healer - but they're fast, fun, well-designed and not reliant at all on specific class abilities. Yes, there are some sections where a class can help a lot, but it's nothing game-breaking. Even crowd control isn't necessary. A lot of the mobs in the 3 instances I've done don't run, and if you do have the appropriate CC it just speeds the fights up.
All this said, as much as I'm digging my shaman in expansion beta, they really need to buff the hell out of this class. It's pathetic compared to warlocks, hunters, mages, rogues, druids, paladins, priests... everyone but warriors, who just require a little tweaking (and of course they'll get it, since they make up the majority of WoW, so blizzard will hear their complaints quickly and adjust). The main problem is shamans still don't excel at their 3 different roles like paladins do. Prot pallies EASILY out-tank DPS warriors, Ret pallies pull off a LOT of burst damage, Holy pallies remain the most efficient healers in the game. Shamans who go too far down enhance or elemental just don't bring the DPS they should. The only viable endgame tree is resto, but it's not quite as badly in favor of resto as affliction is for locks.
On to my lock, since a lot of people in the recent pages play locks along with shamans: I am hating my lock in the expansion. Affliction was fun way back when DM wasn't even released because nightfall procced all the time and my mana was near-limitless with dark pact + imp or succubus, so I had to keep myself aware just to use up nightfall, but I didn't have downtime. Affliction in beta now = put 2-3 dots on the mob and watch it die, drain tank it to kill it in 15 seconds or less. Demonology is decent because the felguard is such a cool pet, but destruction blows for grinding. Affliction is so overpowered AND boring that I can't tolerate playing my lock as anything but demonology, which also gets old fast. Maybe I'm just burned out on my lock though. All the way back when I first made him, I really made him cause I had experience with the class in beta up to 40 (and the first 30 levels were before ANYONE had talents, when warlocks were ok but required korean-starcraft-player levels of micromanagement) and I wanted a free mount instead of having to grind for one on a mage (the other class I was going to make as a main). I think in hindsight, I would've been better off making a different dps class than warlock. But even at times when I've really loved playing my warlock (like in retail when I got 8/8 nemesis and went conflag for AQ40/pvp) I have later hated the inflexibility this class has, and it hasn't changed enough in beta. Blizz really seriously needs to go back to the drawing board and fix demonology and destruction, because affliction 1) scales far too well with gear and the talents and 2) has some really wonky hit/miss talents. A good example of this is improved drain soul - it's good to help combat downtime, but I personally do not burn through shards enough to make use of this as much more than threat reduction. If I wanted to take advantage of the mana gained while soloing, I'd have to toss out all my soul shards after not too long. Just making and using healthstones constantly is a waste since I'd be losing mana overall, too. So basically, improved drain soul is a good talent in theory, but absolute garbage in practice. I would honestly say remove this talent altogether and put the reduced threat somewhere else in the tree, like on a talent most locks would take anyway if they're going to spec affliction, such as nightfall or grim reach.
As far as the hit talents (and these are really over the top) - improved curse of agony, empowered corruption, contagion. The way these stack with shadow mastery is just ridiculous... I don't have any UI addons in the expansion beta, but I'm sure if I totaled it up my CoA and corruption would add up to at least 6k damage with all those talents. Siphon life is honestly borderline overpowered, yet before the DOT changes it was pathetically underpowered. Soul Siphon is also insanely over the top. Dark pact scales nicely now but is useless IMO simply because you're going to gain better mana using improved lifetap + soul siphon on drain life. On my current build (43 demon, 10 affliction) my lock heals 263 (give or take 1 hp) every second with drain life up after JUST CoA and corruption. Consider that I'm spending about 750 hp for 900ish mana (I only have rank 1 improved lifetap - at 2/2 I'd be scaling up to 1100ish) and I drain back a HUGE profit compared to the mana cost... I don't know. I just feel way too strong with my lock. Nothing's a challenge except when I went destruction, and that was only a challenge because of frustrating mechanics and lackluster talents.
The thing is, as boring and overpowered as my lock feels, I'm sure it would be a LOT more enjoyable class in the raid game. But I just don't give a shit - I'm personally going to be playing shaman/paladin/hunter unless blizzard puts a lot of attention into balancing (not nerfing into the ground, but definitely nerfing a little bit) warlocks. Nothing makes me nervous, and it's like the mechanics just aren't what I've had fun with in retail. By comparison, the second easiest time I've had leveling has been on my hunter, but there ARE some times when I get nervous with him, like when my pet's in danger. With my lock, destruction is the ONLY time I've felt in danger, and it's only been because it's flat out gimp as a build. I'd like to say it could scale really well with gear, but you know what? Affliction will scale at least 50% better overall with the same gear, and that's considering blizz so far has only made one t4 set which tries to accomodate affliction and destruction and ignores demonology, so it has some useless affliction stats on it like spell crit. So, I personally feel like blizz needs to nearly go back to the drawing board with locks. I'm just not having fun with mine anymore, no matter how much I try. Anyway, sorry for the long-ass post, I just had to explain why I'm enjoying my gimpy character and hating my good one.