Not enough changes to make it stand out from the past. Also the broken AI is a real game-breaker. Stick to the old ones.
I think the franchise is very nice but this game hasn't altered enough to make it stand out from the past games.
The multiplayer against someone sitting next to you is, as always, great! So is the online multiplayer. I think it would have been better if the maps were bigger but that's my style. I think the arsenal should have been bigger to provide more fun.
The singleplayer doesn't provide anything special. It's just necessary for gaining credits which allow you to buy special weapons.
In short, worth to play if you never played it before and when it ha been patched. Otherwise, stick to Armageddon.