Besides everything that's already been mentioned: No commerical breaks in the middle of freaking questions. Heck, they should try to avoid having them mid-round at all, though I wouldn't have as much of a problem with it if a round goes on for an unusually long time.
And continuity. Have the speed round winner or contestant who defeated the hero become the new hero. Of course that means you'd have to air the episodes in order, and we all know nobody wants to do that anymore.
(Honestly, I liked M2WI better than this. Contestant sob stories and Guy Fieri notwithstanding, that show at least had some variety in its proceedings.)