Erm....
Two sides being presented here, so i'll try to be mister neutral. The single player is a joke, espically after the first one, but it helps get you to grips with the controls. It is worth a try, Even if nearly every joke is "DERP COD SUCKS BAD DERP" and the story is naff, but MP is where the majority of the game is. It's more about teamwork then COD, and using a mixture of tactics, to try and defeat your foes. For example in rush mode, I flanked the defending teams base, and blew up an objective, allowing my team to spawn in their base, and some other guys to charge in. Vehicles are also present and are properly used, unlike in WaW. The class system is easy to use, and the destruction aspect of the game is clever.
However, the game is one of those games which when going well, is awesome, and when your doing bad, is shite. Teams are all that matters here, if your up against an orginised team then you are going to lose. Even with the odds in your favor, you will lose. Noob weapons are now common with each class having a weapon you'll be killed with repeatedly. The perk system is bull, having been nicked from COD (magmum ammo is stopping power, end of) apart from vehicles where it works well.
Thats it really, off the top of my head what I think of the game. It's good, but I found COD more consitent with it's fun, and at least it didn't do a complete reversal of it's story. Seriously, try the first one. It had a fantastic story, much better then this one. MP was more fun too...