It was horrible. I found out about it on Saturday, and Worlds 117 and 77 were having problems at login, it was all over the official forums. Basically, I couldn't get in because they were both being hammered with too many requests, despite being 1600 full each.
So Jagex encouraged everyone having trouble to go to World 88. There was like 10 people.

So then I tried World 7, the F2P one, although I knew of the huge XP penalty for combat >90 and the lack of double XP. It was even worse. You'd think that hardcore F2P dungeoneers would be able to memorize the simplest strategies for taking down dungeons quickly, but they aren't the brightest bunch.