I've been out there once this summer, and it's really a pretty decent crag. Around 65 routes from 5.8+ up to at least 5.13b. I've only done a handful of the climbs there, but those criticisms don't seem justified in my opinion. The biggest negative at Area 51 is that it just doesn't get that much climbing traffic, so there is a lot of small, loose rock to rain down on your belayer. You can contact the developers at area51climbing at yahoo dot com for more info or a copy of their guidebook (that email address is from memory, but I think it's right).