I love Call of Duty. And it was a shame I can't get COD4(PC) yet because of the M rating... until I learn that the SP 5 hours long. I am really disappointed with this. I know FPS games aren't really the kind of games to have really long SP, but 5 hours is ridiculous. I will probably won't enjoy COD4 long, beacuse I not really a online multiplayer fan which was focus a lot for this one. Maybe I could this game when it $20 and I could enjoy online multiplayer by the time that happened(and when I old enough), but I couldn't see myself getting this game this year even with a teen rating. I glad it got great reviews but I wish it got a longer SP.