Overall I really enjoyed my first visit. I was quite impressed with how they were able to use the preexisting space of the building, wrapping displays around corridors and utilizing the original brick interior. It made for a very cool vibe, industrial and totally Cleveland. I also thought the exhibits were really neat. The freshwater room was an interesting idea, teaching you about local species native to the area. The touch pool is a cool feature, especially for kids, and I loved walking through the tubes of giant shark tank.
Really, I only have two criticisms. As everyone else has already discussed, the aquarium is pretty darn expensive, over $20 for an adult ticket. This is especially off-putting when combined with the fact that you have to pay to park. Also, I felt like the signage inside the aquarium wasn't nearly as informative as it should have been. Quite a few times the tanks featured far more creatures in them than what was labeled on the placards. I'm still wondering what the weird little blobby thing in the seahorse tank was!
In conclusion, a cool place to go if you've got the dough.