I visited here last August. I personally thought that the Marine Science Center, located a short drive from the Aquarium, was much more interesting. There were lots of marine scientists to talk with, and it was more of a "hands on" type of experience. It is also free, though donations are very much appreciated. Its former occupant, Keiko; made the OC Aquarium famous and though interesting, was not what I expected. My perspective may be somewhat jaded though, by the fact that I have been to many northwest aquariums that I think are much more interesting.
If you own or manage Oregon Coast Aquarium, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.