Maps of WaW or Blops1....it seems ultra common that the maps are not really liked. I know I dislike them...heck they could even make a lot of money by charging their 15 bucks...I would pay it. Sure some would call them whores...but sheesh change it up...and they don't even have to put in much effort.
I'm probably in the minority on this but I would be happier paying a $10 fee to play the game for multiple years with maps and guns as dlc. In the end you pay less because you are not buying multiple games and map packs that you only use for 1 year. You would have something like 60 maps to play over a 3 year life cycle and then when a new game comes out they actually had time to make changes.