Every aspect of this game is purely awesome!
Single player: You can do the campaign or special ops. Campaign mode told a story that had me staying up all night just to finish the story. Some ppl have said that their game froze or locked up, i say, get a better computer. I never had my game freeze. The missions in SP, some were easy, some were difficult! It didn't matter if the mission was easy or not, all missions were written really well, and had enough depth to make you think you were actually in game. Along with the campaign mode, there's special ops. Special ops has you complete certain aspects of the game as an achievement. These missions are just as fun to play as the campaign. I find myself constantly tryin to complete these missions to open up the harder ones.
Multi-player: I'm gonna say it right now, and hopefully the trolls stop reading after this... Multi-player is AWESOME!!!! You don't need dedicated servers to enjoy it, the game works just fine. IMO, I think all those ppl whining about the lack of dedicated servers need to get better at the game. I'm not great myself, infact, I get wasted quite often, but I also am able to waste others. I think it all depends on who you're playing against. If you're on the fence about whether or not to buy this one, do yourself a favor and just get it, you'll never regret it!