Good single player (albeit short), lacking multiplayer.
I'll start off with my brief summary of the single player (since it won't take long). To me this is probably the only part really worth playing. Love the story and how action intense it is. I only have problems with how the enemies constantly respawn, since this can force you to have to play the same parts over and over again. Though overall, it's definitely worthwhile.
Now on to my least favorite part of the game multiplayer. The online multiplayer is so unbalanced, it's ridiculous. Basically the lo-down on this, is that it's too much about being able to run and gun. While this can be appropriate for FFA, it's very unappropriate and a true killjoy in Team Deathmatch. Team Deathmatch is completely ruined with that type playing style, but that's not the only thing that ruins it. The other is respawning. With respawning, the game becomes less about working as team and more about who can get the most kills on that team. There's no tactics, only a diehard Rambo/Gungho type could find this "team" style exciting. Some of the other things that ruin it are the perks and killstreak rewards, honestly this stuff needs to stay in games like Halo. Especially the killstreak rewards, which completely unbalance the game. One other thing I hate is the heartbeat sensor, it's nothing more than a cheap tool used to satisfy idiots who hate "camping". Also a lot of the upgrades are redundant, but I guess simpletons need something to keep their add brains attentive (what an actual challenging game wouldn't be enough?). I think earning the same upgrade for a different weapon completely destroys the game, it's boring to earn a suppressor 10 times, why not just cut the add-ons as something you earn and just make them available?
In my opinion what could easily make this game better, is to remove kill streak rewards, perks, the redundant earning of add ons (seriously it makes sense to limit them only to the necessities and cut the crap), and respawn in team death match. Honestly the game should be changed from an arcade run and gun to a tactic based FPS, where teamwork actually matters (though like I said that kind of gameplay could be retained in FFA). Also objective type multiplayer gameplay would be a nice touch too, as it would add variation.
Overall this game is highly disappointing and could easily be changed into a better game. I hope they take things into more consideration in further installations.