The game itself:
The single player campaign is quite fun, plays alot like CoD, but with a little weight. And the guys in the B-company are really funny
Good graphics, awesome destruction and amazing sound design.
Multiplayer;
Crazy fun. Not as chaotic as CoD, which fits me good since I am tired of all the random shit that gets you killed in that game.
Also, it encourages team work in a good way. You get points for healing and reviving if you're a medic, repairing veichles if you're an engineer, providing your team mates with extra ammo as an assault trooper and so on. This is freakin awesome when playing with people who actually understand the game.
The game modes "Squad deathmatch" and "Squad Rush" are great fun and I believe these are the game modes that are most fit for competetive gaming, but I have no idea how previous Battlefield games have worked in competetive circles, so I might be wrong here.
Edit:
One complaint though: The server browser is slooooow.... But DICE are working on that, I think.