The MBL seems too powerful because it was.
They were parodies of superheroes, and each one had a pletora of powers. Smasher, that I count like one of the lesser one (it was a secondary character of Gooz, basically, to replace Gooz the character when he was dead... a thing that happened three or four time!
) had force field, laser blast, superforce and could fly!
They always fought baddies with universe crushing powers, people of the caliber of Gob Kamphausen, the Anti-Moderator or the Hyperboard Entity.
My intent is to show them as powerful as they were originally, and also much more used to team work than Vanguard, but, due to my inability to write good battles, I am not sure it will work.
On the other side, I would show them how much more complex is this world, compared to the square cut one from which they came from, where baddies and good guys could be separated at first glance.
But challenges for them will arrive.