Heroes-style setting, Marvel Universe RPG rules

Hey all, I'm considering a game using the Marvel Universe RPG rules with a 'first supers in the world' kind of premise. Worry not, those doing without the rulebook can leave the character creation nuts & bolts to yours truly. Balance issues are ruthlessly pre-resolved courtesy of story elements, including an honestly interesting approach to character advancement. Gameplay itself uses a diceless system that's fluid and ridiculously easy to learn, yet still does a great job at being evocative.

Essentially, freeform storytelling, with the structure in place to enable tactics more than rules. Concerns?