For benefit of the doubt, I gave Corkscrew Follies 4 stars, because 3 was too low and there is no 3.5.  Yes, Corkscrew Follies is a decent and pleasing expansion to Roller Coaster Tycoon and offers many new scenarios  and editing capabilities to the original, but it seemed slightly rushed and  there were many obvious additions that should have been made but were not.  Let's hope they end up in the second expansion slated for the summer of  2000.