I love love love FPS's and I just don't get the popularity of COD4. Don't get me wrong. I have it, and I play from time to time. I had the 360 beta and was kinda hooked for awhile.
But it's the same damn game we've all been playing for years, only with ranked games that having nothing to do with whether you can play the game or not - only how LONG you've played.
It's fun but WAY over-rated IMO. I'll take TF2, Warhawk, Battlefield and Resitance and say they are all just as good and just as much fun. I might even put Frontlines on there for MP. I prefer Halo over them all, but that's just because of my personal preference and my gaming history more than anything else.
So no opinion on the maps, as I didn't buy them.