Battlefield on 360 has improved graphics and some neat touches, but overall has nothing knew to offer for those who...
Battlefield 2 for Xbox 360 has a really nice online multiplayer that will keep you up all night on the weekends, but Single Player is still as dull and idiotic as the Xbox version.
Gameplay
Single isn't even worth mentioning or wasting my time talking about, so I'll skip right to multiplayer. Online for this game is absolutely phenomenal fun for a port game. Being a part of a huge battlefield with so many vehicles, weapons, and strategic points to take advantage of, the 360 really takes Battlefield to a new level for console gamers. 12 v 12 matches are very intense and really fun when you can find a good "Hot Spot" and just sit and pick people off. Conquest is by far the best part of this game, making it like a modern military Star Wars Battlefront FPS.
Graphics
The graphics are really amazing in this game, especially for a port. Lighting effects are really good but the best part is the character models. They grit their teeth when unloading a full auto weapon on someone...and the fine details really show with the 360s power. Also, the level of destruction adds to realism. Chip of the walls and pieces of dirt will chip away or disappear as your getting shot, making for an exciting moment when you see a chunk of wall disintegrate right by your head from a sniper bullet. Explosions and fire effects are very medicore, and environmental/nature effects are okay as well.
Sound
First off, all who have played know that the announcer can get really annoying, especially if you're on the team where he doesn't even speak English, and although this might add to the realism...it makes you sorry you have a 5.1 Surround Sound System because you have to take it from all angles. Guns and explosions are good, but nothing special. Also when a person dies the character makes a grunting sound sometimes that can be humurous...but then you snap back into reallity. Probably the best of the sound department would be vehicles because you can always tell when a tank or car is pulling up nearby...and helicopters have a distinct sound, but it always makes you wet yourself when you're caught out in the open field with nothing but an assault kit.
Achievements
Achievements can be a chore, but can easily be done with a little help from a friend. I think with a Single Player as crappy as this achievements shouldn't be there to force you to play it...and the online and offline achievements are almost identical except you just achieve them with or without a friend.
Overall
If you like Modern Military FPSs then definatley check this out. If you didn't like the Xbox version you might want to at least rent it unless you absolutley despised it.