Three of my least favorites:
Tomb of the Headless Kings, it was so dark, so time-consuming, and hard to complete with so many vines hanging.
Medusa's Lair--Too time-consuming and hard. When I first saw Legends re-runs, it was Season Two Layout Two, can't remember what episode but there were four snakes and I was like, "move it, move it!"
Second Season Throne Room--It was cool and all, but when I saw Season Two Layout Two the contestants sat on the throne and it spun round. Then the next guy came in and had to sit on it again. It is basically time-consuming, and I think they should have just kept the throne in the center, like in Season One, but have the armrests and the wall on the back of the ladder, as well as the objective of actually "sitting" on the throne