So I've been doing some thinking about how PvP has changed for better and worse with 2.0 and felt like writing it up for you guys, so here we go.
Balancing:
2.0 did quite a bit to change weapon balance. This coupled with new subclasses has altered the landscape significantly. The new supers are not well balanced with each other or previous supers. The Sunbreaker super is completely broken in its current form. The issue with Sunbreaker is that you receive an enormous amount of damage resistance while also having a ranged one hit kill with multiple shots. Compare this to golden gun where you have no resistance and have 3 opportunities for a kill and have to be relatively accurate to be successful. Hammers can be tossed a couple more times and have perks allowing for homing as well as health recovery upon kills. This badly needs to be reduced to something like 125% health as opposed to 200% where it seems to be now. Stormcallers also receive significant damage resistance, but it is not so egregious as they have to be close like Bladedancers to be effective. I think reducing range slightly would put them in a good place. Nightstalker is a very fine and average class that fits well with the current balance. My only complaint would be tethers not activating or shutting down supers fast enough. As for weapon balance the best thing that happened was the removal of rerolling. In HoW this made PvP very homogenized with everyone sporting the same loadout of God tier rolled weapons. Unfortunately many players still cling to these weapons making bit frustrating to use current weapons which are much more reasonable. As for actual changes to weapons there is good and bad. Rockets are no longer the only option now that h&h is slightly nerfed, making heavy a pretty even playing field. Sidearms are now useful and quite fun. Fusion rifles seem to be a bit more useful but still not optimal. Shotguns are still ridiculous. Nerfing the OHK range extending perks did far too little to change the landscape. The top impact class of shotgun simply needs to be removed from the game. Snipers are fine. Some have noticed increased auto aim, but I haven't personally. They are still a skill weapon and don't really feel overpowered. Auto rifles are competitive again and feel pretty balanced in terms of range and ttk. Pulse rifles are too prevalent now. They were already the best option in HoW and now everything around them has been nerfed aside from ARs. PR's are too effective both at close band long range beating both HCs And SRs in most encounters. Pulse rifles also make you flinch to much when damaged by them. Hand cannons have been nerfed as a result of 3 excellent ones and now have poor range and are now beaten by pulse rifles at close range. To remedy this hand cannons need better accuracy, especially while moving or jumping, more stability, and more of a staggering effect upon targets. Scout rifles have never been in a great place, but they haven't been terrible either. Currently they just need to be a bit faster or a bit stronger.
Incentive to play/Enjoyability:
Currently there is little reason to play PvP aside from daily matches for legendary marks. Legendary weapons don't seem to drop as frequently as they did in HoW and you no longer make steady progress by earning marks to make up for this. The mark economy alongside the new quests tied to crucible has led to a different type of player spending time in the crucible. Teammates might not care to win since marks are guaranteed, others may leave because they only needed a few kills in the game mode, and some will run around with sword hilts trying to complete a quest. Overall it feels like people are playing PvP because they need to rather than because they want to, making it less fun for everyone. I enjoy the addition of new modes and permanent inclusion of others. Map selection is very poor though. For whatever reason, in the main playlists the Dlc maps are weighted way too heavily making it feel like there are less maps now than a month ago. This would be one thing if the new maps were all enjoyable, but I'm afraid that Sector 618 and Drifter are beyond redemption. Sector is bad for reasons I can't pinpoint, while Drifter is my personal least favorite due to having to wither be trapped in small tunnels are sit in the open while being exposed on all sides. I have little desire to play classic playlists though as I still enjoy Crossroads and Dungeons quite bad bit.
The Future:
I'm very interested to see what the future holds. I hope that they do quarterly balance patches like Luke mentioned. I also eagerly await the return of Iron Banner and Trials as they will bring a more competitive feel to the crucible and encourage players to use new weapons. I also hope Bungie continues to address networking issues such as lag, as well as addressing people playing with extremely poor connections whether maliciously or otherwise.