most of those coasters, especially that "loco" one or whatever, it just looked plain wrong, and you were using prefabs! i'm guessing you are an amateur designer, then? just a tip, try using a thing called the AHG which can be found in the tools section of this site, and also try to not use prefabs, they can make a ride look extremely tacky, i am no support artist myself but they can look amazing if done right.
Cradled by two loving arms that I'd die for,
One little kiss and Felina goodbye.