I am going to go old school as well. The rapids ride was very over rated at the time. It obviously made such a poor impression on me I do not even remember its given name. The commercials made it look a lot better than it was. People were better off riding the log flume twice. (and I will not call it the saw mill)
Underrated back then was the Rotor. no one knew about it and, if you were lucky enough to go on it and not know the floor was going to drop out, you had an extra special thrill. The only ride I never dared to do with a full stomach.
I would like to argue an above point that suggests lightning loops was over rated. At the time, that was a pretty unique experience to go upside down and then do it again backwards. I agree that coasters have come a long way since then. It almost makes me afraid of what we will be riding 40 years from now. But, to kids back then, of whom I am one, it was amazing, worthy of the hype.