Regardless of possible poor IQ and minor framerate hitches, i'm just keen to play the SP game and experience the story & gameplay. After the slideshow that was Crysis one on my PC, i'd much rather go for a 24fps 1024 x 720 PS3 port than a 10fps slugfest on my computer.
You got an ancient PC? Else an 8800GT 512MB and a simple desktop Core2Duo will grant you 30fps at 1920x1080 in PC demo at low settings which is comparable to 360 demo (actually the DOF res, edge AA is better and maybe more). Thats not even a high-end PC from 2006 era. But if you prefer PS3 version that fine, just saying.