I believe in the concept if its not broke don't fix it and thats whats happened my favorite multiplayer games

Halo 3 was everything to me (hell almost cost me my marriage lol) had tactical play, you had to have some skill, and the game types were everything to me. Then they did the bullshit known as 4 & 5

COD MW3 and BLOPS was near perfection for me as well and it seems like they haven't been able to fix what they broke since.