Not that anyone cares but here's some of my experience from playing a few classes with the new patch.
*this is strictly PVP, I do not care about PVE, and based on pre-patch Legion. I know things change but this is now.
Paladin (Holy)
Seems really strong, but not much different than pre-patch. Your rotation is different and not as fun since denounce isn't in the game and you no longer have rebuke for some control. You're more of a healer now but since you'll likely have repentance you'll also have a lot of CC with hammer and repent. You can still pump out good damage with Avenging Wrath up but doesn't feel as frantic before with denounce spam. The DPS is similar as your holy shock hits enemies much harder as does judge. Crusader Strike is ok but really it's too risky and the HPal mastery kind of sucks. Having to be within basically melee range for your heals to be strong(er) is not a good design for PVP since it puts you at a much greater risk.
Paladin (Ret)
Seems good. Good dueling class, can beat just about anyone with all CD's and quite a few with only a few CD's. I don't like to bubble or bop in duels so I just take a loss if it comes down to that. Only way I'll do that is against some super OP shit or if another class is going full tryhard as well. Ret is still kiteable, nothing has changed there. Hand of Hindrance is cool but it's too long of a CD to me. The new defensive CD's are neat, your burst is great, your survivability with CD's is great. The new rotation feels better with that new Blade skill that gives 2 holy power. Judgment not giving holy power is taking some getting used to. No exorcism or templars verdict ranged attack hurts.
Paladin (Prot)
Never tried this pre-patch but it seems pretty freakin strong in duels atleast. Garbo in arena. Good survivability with a ton of block and parry. Good damage with avengers shield and shield of righteousness. The rotation is fast pace and you always have buttons to press.
Warrior (MS)
Insane damage with Focused Rage stacked up. Survivability is not so good but a flat 20% dmg reduction with defensive stance is solid. They're really strong with a healer as always, I don't think they're very good duelers though.
Rogue (assassination)
Alright this class is good. Rogues are strong as hell. Their opener is insane, have not tried shadowdance will today though. Their biggest weakness is their defense. One good stun and you can flop, a warrior will eat you a live if you have no trinket up for a shockwave or stormbolt. I look at recount and I don't even see where all the damage comes from, people just fall over.
Monk (windwalker)
Pretty average imo. Good sustain damage their burst isn't scary anymore though. Their fist of fury doesn't stun (at the moment) and does a lot less damage. Great duelers as always though.
Warlock (any spec, maybe except destruction?)
Affliction damage seems good, the other specs I'm not so sure. Their survivability is the best I've ever encountered in WoW. Insane self healing and defenses, absorbs etc. Something not right about locks.
Death Knight (Unholy)
I had high hopes for this spec and maybe in Legion it really shines but now...naw. This dot, kiting, ranged spec for PVP is very unappealing. The damage is pitiful, your survivabiilty goes out the window once bone shield is down your pet can be murdered, you can't deathcoil the pet for heals, you can't deathcoil yourself for heals (since lichborne is gone), your self healing is minimal with only Death Strike. There are many things wrong with this spec in it's current incarnation. I'm sure things are different in Legion but this is a review of my experiences with the pre-patch.
Death Knight (Frost)
I have not played extensively with this one yet. I do not like it one bit though. Having to rely so much on obliterate now (which is affected by killing machine instead of your frost strikes) is something I don't like. Your survivability, lol, AMS and IBF? You're a sitting duck. This spec gets shredded. Death Strike for heals. Your CC is gone too, no strangulate (at the moment) no way to spec into asphyxiate. Death grip and slows or if you can get in close for long enough Remorsless Winter can stun them. Not digging DK AT ALL.
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Also, of all things they've removed from the game or pruned they have left one MAJOR annoyance factor still in since Vanilla.
Daze mechanics. Why is this still in the game? It's very annoying to be chain dazed by mobs your level or lower especially in water. I can't believe it's still in the game honestly.