Rollercoaster was released at a time when disaster movies were very popular. I guess that's why it's been labeled by many critics as exactly that. But it's not. It's a very clever thriller with some great dialogue. I wasn't too surprised that Columbo creators Richard Levinson and William Link co-developed the story and wrote the screenplay. Especially the conversations between George Segal and Timothy Bottoms are just as good as anything you've ever seen on Columbo. This is a very underrated movie and during all the Sensurround hype the finer qualities of it got overlooked. So maybe next time you get a chance watch it again. Perhaps you'll be surprised.