I've been to Joe's about 50 times in 2008. It's better than most but so terribly inconsistent, even the slices. Which, by the way, they often kept out for too long, and is fucking gross.
As far as pizza slices, NYPD is better, and the Pizza by Napoli place on the NW side has got them both beat. Some of these reviews are from people who went there piss drunk and wouldn't know the difference between pizza or cardboard. The good pizza I had here, well it was great, so I'd give it 3 stars. But I wouldn't wait in line for more than 10 minutes here, even if I was starving.