I think it's a pretty decent list. Maybe would have preferred the best ten transformations instead of the best five (since quite a few of them are rather predictable choices), but it's good regardless. Interesting to see a Master of Disguise transformation there too!
So yeah, cool. The music's nice in the video too, the final boss theme from Master of Disguise and the Crescent Moon Village theme from Wario Land 4 are amazing.
Constantly having to press A to do stuff isn't fun. With Vampire Wario you have to do that to fly. Also, I don't like Bat Warios design. The music is cool though.