I think in high level play, most Power characters will end up being top tier..
Unless they take off the interactables, the advantages they get don't seem to be really fair. Depending on where you start on a stage, they can throw a car at you for a quick unblockable 20%.
Not only do their combos do more damage, they have advantages like that as well.
Gadget characters have to be near the enemy to hurt them with an interactable
And other characters can't do anything with it..
I do see interactables being banned later on because of the advantage Power characters get over the rest of the cast.