If you wish to review a ride, try sending the idea (through the "Contribute" link) to Jeff as a new feature. Give a brief description of your idea, and he'll get back to you (as soon as he can, of course ;)).
If you're talking about ride reviews comparable to park reviews, I don't know. Those take an awful lot of time to read, edit, and format.
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Matt Lynch
Co-Webmaster, Kennywood Boulevard
http://kennywood.coasterbuzz.com