While Aquatica is not as well themed as Volcano Bay or the two Disney waterparks, I will defend it on one area that I think they get right.
Too many waterparks in my opinion only have slides and other attractions at the extreme ends of the scales, e.g. some for kids, the rest for extreme adrenaline junkies. For someone like me who is an adult who likes mild thrills but isn't a super strong swimmer, there's usually very little middle ground.
Aquatica seems to be the exception to this rule - I found plenty of mild but still wild enough slides for me, plus you had the choice of a lazy river and a not-quite-so-lazy river, as well as plenty of kid friendly areas and more extreme slides as well. It really seemed as though they were trying to cater for everybody.
However speaking of catering, don't rely on their food. We had free dining at Aquatica due to our SeaWorld tickets, but if we hadn't I'm not sure we'd have bought anything - it was NOT good!