Thorpe Park sounds grim, too. Here's a review from the thread on it:
We booked to stay in the cabins, but ended up leaving.They are ship container style accommodation placed on top of each other. There is no windows or natural ventilation. The top bunks are very close to the ceiling. I found it incredibly claustrophobic. It probably didn't help that it had been an incredibly wet day. We were all soaked and there was no where to hang and dry out coats ready for the next day.
People need to vote with their feet regarding these places. But they won't.
Crazy prices, treated like mugs, stuck in queues all day, miserable. Ker-ching.