Well, my wife and I just went there three weeks ago, and all I can say is prepare to be blown away. The theming is not just "great", it is simply astonishing. I'm not a fan of "theme" parks, but IOA is spectacular in every way. If you are a Dr. Seuss fan, which both my wife and I are, Seuss Landing will bring tears to your eyes. The Carra-Seuss-el, the merry-go-round with Seuss characters, is, plainly stated, a magnificent work of art. To say that the Dudley-Do Right ride is the best flume ever built would be an insult - it is a legitimate thrill ride with mind-boggling theming. Same for the Bluto raft ride. And the Jurassic Park shoot-the-chutes ride (significantly better, oddly enough, than the one in California). As far as advice goes, I'd suggest turning right at the main entrance and heading straight to Deuling Dragons. Most people head left and go to the Hulk, which is at the front of the park. After a couple rides on DD (we preferred Ice, although most seem to like Fire better) go to Spiderman. Be warned - the line may be long, but it will only get longer. And it is prone to (repeated) break-downs, so getting there early increases your chances of not getting shut out. And it is worth the wait - a huge leap forward in ride technology. After that, do what we did - wander around with our mouths hanging open. IOA is as good at what it does as Cedar Point is at what it does.
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Age and treachery will always overcome youth and skill.