I looked at Manta via YouTube vids/reviews and I gotta say it does look pretty amazing. I don't know if it would have worked for a Disney park. It would certainly bring people in, but we'd probably be arguing about whether it was themed enough. :lol: Still, I say SeaWorld did a great job (the aquarium queue looks nice!) on this coaster.
I can guarantee to you if they built Manta in it's current form at AK there would be one heck of a lot of criticism from fans. We would never hear the end of "off the shelf", "bare steel coaster", "no story", "not fitting the theme", and "belongs in 6 Flags".
Disney are held to a very high standard, and quite rightly so. Never mind how good of a coaster it is (and let's face it, all B&M latest and greatest are good) I just find it funny that people are OK with a bare steel coaster in Sea World, but it would be a whole nother story if that were at AK.