I'm going to recon that this is really just a matter of typical hardware failure rates. Optical drives die. Some last longer than others, some die within months of purchase. It happens in the PC world too.
But I've actually had great luck with consoles. Other than my very first PS2 being DOA (christmas morning, thing wouldn't turn on), the next day I was able to receive another launch PS2 from the store in exchange, and that PS2, while I don't use it anymore, has never failed me. I think I had one Disc Read Error during my entire time of ownership, and yet people were complaining about the launch PS2's optical drive forever.
My PS3, also a launch 60gb unit, has yet to give me one hiccup. Software has crashed it, but that's the software issue. Not yet has the drive given me problems. I use it for Blu-ray, DVD, and PS3 games.
There have been people with PS3s dying. But there will never be a console manufactured that doesn't fail for someone. It's the nature of electronics, especially when moving parts are involved.