Never played Battle Field, but I hear people are stoked about it coming out soon. Is it really THAT good?
If you like your shooters slower-paced and tactical, absolutely. It requires more thought than Call of Duty, in the sense that running and gunning will serve only to get you killed. I love both games, but for different reasons. Battlefield could be best
described as the "thinking man's shooter", while Call of Duty is the every-man's shooter. As for your Call of Duty needs the best thing I can suggest is to watch matches after they've finished in Theater Mode. See how the leading players act and so on.