I won't lie; I'm having a hard time finding the direction of the gunfire, and by the time I do, I've died. 
Concerning MW3, I may renew my GameFly subscription, and give it a shot. This way I can have more than a day to check it out.
Yeah, BF3's warning/notification system for directional fire sucks lol...it's like a light orange type indicator, I hated it. Plus, with everyone and they mama looking for cheats, physically impossible hiding places, etc, half of the time you wouldn't be able to shoot them even if you could see them!
I will admit, I'm a COD fan, I can take the games for what they are and keep away from self-important reviewers comments. It's a very smooth. playable game, and for that alone I like it. I say give MW3 another shot; heck, if you play on PS3 (can't remember if you're an XBoxer or PS3er) hit me up, Stix2002. (again, I'm not that good, so no snickering at my 15-64 games lol.....)