I've got it but haven't played it that much. I got CoD4 (PC) on the day of release but have only now got round to playing it online and I'm a tad addicted now. I'm only level 16 though.
Got it and completed it, very good singeplayer shooter. I played it online once, but isn't that great online. It misses the speed of something like COD4 or RFOM. Currently playing Army of Two. Great shooter, but don't expect a good storyline.