For me? It's an extremely well executed a produced show with choreography that FAR exceeds what's accepted as theme park dance. It's ridiculously high energy, with a visual technique that catches the eye. But that's not the only reason why I think people are praising it so highly.
It's smart. It's the smartest show I've seen any theme park present in a while, and it doesn't dumb the story down or spell stuff out for the crowd. It tells a complete, and relevant, story without dialogue, but with plenty of style and flair. Part of me expected more as far as variety acts go, but even there they cleverly explain away the limitations they have.
People complain about Universal shows being poorly written, amateur, and uninspiring. AoV is none of those things. It won't be for everyone, but trying to make something for everyone is good way to achieve mediocrity. Carnage survived on the individual performances of Jack and Chance. This doesn't suffer from that.