I just watched Top Gear USA.
Oh man, I was cringing at how horrible it was. The beauty of the original Top Gear is the chemistry of the hosts, not how flashy all the cars and HD camera work is. The hosts are 3 ordinary guys but they all quite different in terms of personalities, appearance, eccentricities, and they all are always teasing and making fun of each other.
This show is just plain generic and bland. The worst hosts I can imagine are hosting the show. They are stiff, not a single one of them has any personality, and they are all cookie-cutter cut-outs of the same young guy pretty much. There is no differentiation and it's just awful. They are all harmless and opinionless and full of fake smiles and just a bunch of young dudes doing the generic TV host thing.
This show needs it's controversial, highly opinionated Clarkson-esque journalist/comedian that still commands respect but is also incredibly funny and baffoonish with the proper car pedigree (maybe a guy like Jay Leno). Then you need the elder-stateman (like James May's character) and then you have the youngish guy with nice teeth. Not 3 youngish guys with nice teeth like this show has.
http://jalopnik.com/5694780/first-drive-top-gear-usa
This article seem to indicate their wooden chemistry and the fun improves though in eps 2 and 3 so hopefully it will.