Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Mine is defective as hell. It's parts that are defective:

SuperDrive
LogicBoard/Mobo
HardDrive
Prettymuch everything
 
Mine's only 3 days old, but it doesn't have any out-of-the-box problems. It's quiet, fast, no dead pixels, stable, the DVD drive works fine, etc. It does need more RAM, but I've got another gig stick coming on Tuesday. I tend to not put much stock in all the problem reports on MR, because obviously people tend to complain when things are bad, but keep fairly quiet when they don't have problems. I haven't had any serious problems with any of my Macs. That said, I have heard of almost zero problems with these first-gen Intel iMacs, whereas, as everyone knows, the MB and MBP both seem to have lots of heat and noise issues.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.