I haven't been on this, but it sounds (and from the video) and looks like the world's worst dark ride. It's It looks absolutely incredible on the outside, but from what I've heard, it's a complete contrast to what lies within.
I actually really enjoyed it! I usually hate these sorts of rides, cause I have some sort of wierd phobia of animatronics. But it was really fun. There was even a drop, which really got me by suprise! It's more of a kiddy ride, but there are some really fun little bits, like you are going up a spiral lift, whilst a troll spins round and round, slowly getting closer and closer to you. I enjoyed it.
The queue on the inside is horrible. Sometimes it's quite cool. For example, there is a lovely bit where it looks like you're in a hall, and it has a sort of trap door, which occasionally shakes and bangs. But most bits are small, hot, dark, and claustrophobic corridors.