I think its cause people just WANT to have fun but getting killed alot and getting killed by lucky shots (i was once killed through 2 boxes on Highschool with only one scout shot to the head) But yea i get this post.
Yea I found that when I play COD4 on my PS3 that I tend to play better when Im not so score conscious, and actually having fun. I think Ill start playing more for fun on Counter Strkike because I only ever get annoyed about my score when Im paying attention to it and trying to hard to get kills to improve it.