you are right, you will never get proper teamplay in MP unless you are in a clan. as a vet. of delta force series, everyone would either be a lone camper or a loneranger armed to the teeth to take on the enemy and grab the glory. The loneranger teams may work, but its hardly teamplay. there is no way saying "follow me" is going to get people saying, "ok, lets all follow him" everyone wants to be their own leader and wont play otherwise.
Thats where clans would be the only decent way to get proper teamplay as you have said.
Personally i would love to join a clan to have proper teamplay games, but 1. i dont have the time to spend hours practicing, 2. there are always the guys who take everything too seriously. 3. people would bitch at me for having a 56k modem

. so really the best i can do is just play the 'normal' games alongside the 12 year old cheaters, and the one or two guys with like 0 ping and 150+ kills each game. still, its better than nothing.
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I can't help about the shape I'm in, I can't sing I ain't pretty and my legs are thin. But don't ask me what I think of you, I might not give the answer that you want me to.