The extra star in the rating is for Renner's conviction that he really is doing something good.
BUT: I can't help but question the intent of this show. While every episode features a worthy cause, the solutions in form of weirdly transformed and decked out vehicles seem just so overcomplicated and unnecessary. Instead of giving these charities the money they could put to an actual good cause, it is used to fabricate XXL-pimp my rides. And these rides don't seem to be something that can be actually used on a day to day basis by the people in need. Why give kids a real dance studio like the one they used to have, when you can give them a "mobile dance studio" that's way too similar to party busses for drunken bachelorettes. I really doubt that these communities in need will get something out of this in the long run.
In the end, it looks more like a chance for rich white dudes to give themselves a pat on the back then an honest attempt to do some good. But then again that is what Americans do best.