We went on Sunday the 12th and didn't have bad waits at all. We went through the haunted house, the maze and the crypt. Each had about a 30 minute wait and were well worth it. Route 666 didn't open until 8:00 and the line was horrible so we didn't even try it. It would be nice if if could open sooner, but I guess that they have to wait until dark before the effects are any good.
The botton line is that if you want to go to fearfest, go late Sunday afternoon instead of Saturday.