I played AA3 last night.
Although I have 30FPS and it felt hard and confusing at the beginning I got used to it. The thing that I feel missing in COD is the main part of the game.
Team work and doing objectives. Problem With ET is that it's really hard to shoot anybody and you are dying all the time at least at the beginning, and couldn't adjust myself to the game at all. But with AA3 i adjusted after a few game rounds and started to shoot people and do objectives without the problem.
ET is concentrated to the team role playing and that's fine, but just couldn't adjust myself getting killed all the time
The only thing that's bothering me at present is my low FPS that makes it sometimes not playable and that's the only thing that makes me uncomfortable while playing.