One of the most Addictive games I have played in a long time!
As of this writing I have a level 50 soldier and I am currently working on a level 5 Siren. Basically this game is very addictive! The loot system was the first part of the game to draw me in. I am always looking for the latest and best weapons. And if the weapon isnt that great then its off to the shop to sell those guns for cash.
The next aspect of the game that drew me in is the leveling up. Leveling up in this game is fun. Its fun because all you really have to do is perform the missions to level up at a nice pace. Sure you can spend hours leveling your character killing enemies but I feel its much faster to do the missions (even better with a few friends). Leveling up allows you to upgrade your character and tailor them to your likes which is cool.
I also love the fact that the game also tracks so many things in the games. Who would think that the game would track and let me know when I shot over 2,000 bad guys with my smg...crazy. These measures that are tracked are challenges that award you xp which helps in the leveling up of your character. This just really appeals to me. Add in the co-op (4-player) and the comedic style and you have a game that could keep you busy for a good while (Or atleast until Modern Warfare 2 is released on Nov 10)
Overall this is a very fun and addictive game that I highly recommend. Go get this and you wont be disappointed.