I'll got with Neil on this one -- the entrance! So coaster-crazy I'll ride clones... ;)
I suppose one thing I look for is a uniqueness to the ride, either with the coaster itself or themeing, how it is queued, anything. But even the driest reproduction would still merit a try! (Mind you, I haven't been on ANY coaster in a year...)
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/index.html