What's a weird/unusual roller coaster design element that can make or break a ride for you?
I'll go first.
Designers don't always take into consideration the pacing of a ride anymore, instead opting to cram as many tricks and stunts into a ride as possible. (I realize this is sometimes at the request of the buyer.) A coaster should tell a story and pacing is important.
My $0.02 - I have a bad feeling the RMC Wildcat at @hersheypark is going to have pacing issues and I'm not going to love it.