Have you ever finished a round with only 20 hit points left on the one surviving character, and no usable powers remaining?
If I want to dominate a round, Rags/Mags/Spidey will generally let me walk away unharmed.
However, what if cakewalks got almost no rewards, but barely won rounds got bit rewards? 1000 ISO if your team has less than 50 hit points left. 5 ISO if your team has more than 10,000 hit points left.
There could be a tournament sort of like golf – say an event had 9 challenges, each playable unlimited times, and the score is the lowest total hit points your team had at the end of that challenge. The winner of the tourney would be the one that had the lowest total score for all 9 challenges.