The system definitely had a wide range of power levels, and the game mostly worked regardless of relative power level. It also had exploding dice, so that if you rolled a 10, you rolled again. That allowed for certain rolls to "break" the rules a bit, which seems to always come up in superhero comics. It woudl allow for a character like Batman to be able to affect a bad guy who had armor or some form of defense that would normally be beyond Batman's Strength. So that was good. However, it also had the side effect that some random thug off the street could deck Superman and hurt him...as long as he kept rolling 10 on a d10. So a bit of pro/con type of situation.
I always liked mechanics that would allow for such a possibility. In the Marvel game, things were a bit more static. By the book, Spider-Man could never hurt Titania; her Body Armor power was a higher rank than his Strength score. But in the comics, he was able to beat the crap out of her by relying on speed and hitting her so often that it overwhelmed her. She actually developed a fear of him as a result in the comics. In the game, she wouldn't have taken a point of damage.