The mission in COD4 that really got my blood pumping was the Chernobyl one.
When that chopper came down and those blades were spinning and you were running like hell... that's what all games should have. That moment were your heart is actually beating and your really into it and all that. CSS is actually one of the only games that dose that for me any more. 1 v 5 gets intense when the pressure is on. I just hope more games come out with that really fucking intense feeling that came with COD4. I don't know if anyone else feels the same about games but i think that all games should have real intensity.