I like the arcade-ish, Quake action style of Paintball. The jumps, I reluctantly admit, add to the game more than they detract from it (although the hill launching is a little cheap).
I like being able to strafe-jump and increase my speed, but the way it stands is a little excessive, and large maps become tedious bunnyhop contests, discouraging play.
I like the gun pickup system just fine (but I would not contest to a new system, such as monetary-based, if one were properly developed.)
I like the new smoke grens. Awesome!
I dislike the lack of v_models, and they (other than bots) have probably been the single most popular request since the game's inception.
I dislike the lack of bots also, but I don't think it's nearly as important as lots of other issues right now.
I dislike the lack of statistics and think this would be a fun addition to the game. I want to see my kills per minute, hit accuracy, etc. like in Counterstrike (or however else you want to do it).