Well 1 was kinda new (maybe new for a multiplayer game).
2) old (but very well implemented i.e. balanced to each map, better than in any other game I know)
3) old (and not all the maps are exactly large, I found those maps that were too large a big problem in previous battlefield games. result always was: get a plane/copter or walk around by foot seeing no action. In hindsight I think they did a great job here as well. Especially with the Rush mode [which is new, isn't it?] where they step by step expand the map which is great)
4) not sure bout this one, couldn't figure out how well they did though until I was playing the game. The Medic was VERY well implemented. The Recon class as well (even though it is abused as a pure sniper class by a felt 85% of all players), so were Engineer and Assault. They did a marvelous job with the classes imho.
5) that I read on every MP shooter ever released. how should I know from paper that they actually realized this properly in BC2
But they did a fine job at that, definitely.