Did you miss the obvious?
1) It runs on gasoline and it scores low on energy effiency because it uses only the hydrogen atoms.
2) Where's the gas tank?
3) Where's the room for a family of four and some groceries/cargo?
4) It is *NOT* zero emission. It will produce water and some kind of carbon droppings.
5) How much will it cost above ordinary (and more efficient) vehicles?
6) How long will the "fuel cell" last and who is going to work on it when it breaks down?
7) How much in out tax dollars went into producing this monstrosity and how many will be used to subsidize it and it's siblings in the other car companies?
Someone on a call in radio show mentioned that cars dripping water on the road should make for some interesting winter driving.