Best campaign ever.
Once you play the game, the graphics are so much better and more detailed. The weapons are highly more detailed and the levels are awesome too. Single Player campaign is really good but it is a short campaign again which really doesn't bother me.
The online multiplayer is the best thing on this game. The online mode is like CoD4 but so much better. You get to customize your killstreak awards and you can have a AC130, Predator Missile and even a Tactial Nuke which is like 25 Killstreak and it wins you the game which is awesome. Also you can customize your callsign and your weapons. There is a prek called Bling which allows you to have 2 attachments on your weapon which is a dream come true because its so awesome. There are also many new weapons like SCAR-H, Intervention (Sniper), ACR etc. You can also have your secondary weapons as shotguns, machine pistols etc. The highest level you can go is level 70 and you can prestige in this game.
There is another mode called Special Ops where you do different levels with either a mate online, split screen or by yourself. There are many levels like using a AC130 to help your mate or breah a place and smash people. It is really good even if you don't have online, you can still play with a mate or by yourself.
So Modern Warfare 2 is the best shooter in the world and it delivers so much and its the best game you can buy and play.