I, of course, am going to say that I loved the aquarium. Why? Because there were fish and other marine life there. I can't say that I would ever be disappointed to see them, no matter where they were.
The downs. LONG line at the ticket booth - turn around, go back into the hotel, see one of the concierges doing nothing and purchase a ticket from them - no lines, no waiting. Very short. Entire aquarium in 15-20 minutes tops. A little short for a price of $18 per guest. Yikes.
The pros - there were not a lot of overhead speakers declaring what was going on. You got to experience the wildlife for yourself. They have a stingray feeding station. The piranha tank is guarded so that fools don't stick their hands in the tank.