Same with mine craft, league of legends and WoW... It's not just cod... And cod is definitely not the worst..
And yes it seems every game that gets too popular, you have a problem with it.. Cod, assassins creed and gta are a few I can think of right now.
CoD and ACreed just aren't that good anymore, and they just keep getting re hashed. Nothing to do with popularity. With GTA I just don't see what many others see that's so interesting. Oh well. GTA V will be fun I'm sure.
There are tons of other mainstream games that I love. That is not a factor whatsoever as to whether or not I like a game. I love God of War, Uncharted, Fallout, Borderlands, Elder Scrolls, Metal Gear, etc. etc. etc.

I like Bioshock, Dead Space, Far Cry, etc. etc. etc.