Honestly i love W@W to death. It was so good and so much fun, the hackers were fun too! No unlimited uav, everyone got unlimited health and ammo was so much fun. Little glitches in map were annoying but this game was so fun. Some OP guns but you could deal with it. The second best would be Black Ops. I guess i love the Treyarch games alot more than the IW games. They are a little slower paced and tougher to get the kill, and i love the challenge.

Blops 

MW3

MWR

MW2

Never played W@W...

Wrong forums bud.

CoD3.

-Graphical improvement from CoD2

-Vehicles for online

- Ground war w/ big maps w/ vehicles

and most of all, its my first CoD

MWR

MW3

Blops

W@W never played it

Hmmmm....tough call.  For me the best is either Black Ops or MW3.  My problem with Ops was the lack of a working Region search function.  It hardly ever found a host close enough to me that I didn't lag really bad.  But when it did, I loved it. 

MW3 is hacked to death and the akimbo MP's piss me off  SOOOOOO bad.  But when you find a decent lobby it is my favorite.

If they nerf the Akimbo MP's it will probably take the cake for me.  I haven't tried Black Ops since I upgraded my connection, and now I won't be able to for two weeks since I hit my f****ing data limit early, but I still think it will lag for me. 

The best COD is obviously Call of Duty 4 Modern Warfare and Call of Duty World at War (not the Wii versions though). But if you mean for Wii I'd say Modern Warfare Reflex is way better.