Compared to BF2 - you access the game's server browser through web browser, lower TTK, more accurate weapons (these are really the same point), blinding sun in many maps, lots of lock on weapons, vehicle customizations instead of vehicles carrying what they need at all times, that kind of thing. Additionally, there's VOIP but it requires jumping through hoops (or it did 8 months ago when I last played), squads are only 4 players and there isn't much for squad orders ( you can only order your squad to flags basically, you can't issue a move-to order to go kill a sniper behind that rock).
I'm sure someone will be along shortly to spin it in a positive light.