I say its a great thing! MOA, in my opinion, is a good deal!
As for the aquarium, everything I have read about it suggests it is a bit pricey for what you get....maybe Merlin can make it better?
Now I have not been here in a while but from what I remember, I use to love this place when I was young so for all those parents with young ones out there who lives near MOA and can't afford a trip to Orlando, I would recommend it. They have quite a few attractions that are great for the little ones.
I have fond memories of the rides there as most were my first ever on any type of rides. These include the log flume and my first ever coaster, the Pepsi Orange Streak. I still have family up there and they tell me the park has added quite a few new attractions including more thrill rides so hopefully I could check it out once again someday.