I think if you look through this thread, you'll see that for the people that have actually ridden TC, it often seems to end up in the mid-low rankings. Although there aren't that many people who've ridden a high number of RMCs AND also TC, so it's kinda hard to tell for sure.Tsk tsk. Such poppycock. ;-)
My own feelings aside, if I tried to average all ratings of RMCs I've seen recently -- and I must have seen a hundred lists in the last year -- Twisted Colossus is one I most often see in the upper half of the list.
http://coasterforce.com/forums/threads/rank-the-rmcs.38976/