Yes, American Top Gears sucks some pretty large mammal. This is largely due to the colorless hosts, imj. THeir abysmal and one-dimensional nature is nothing like what you see with May, Hammond, and Clarkson.
OTOH, I keep forgetting to watch Adam Corolla's Car Show on Spike. I suspect he might have the good humor and panache to pull off a decent series - and you have to be a flatlining loser to make such a fun topic seem boring (yet ATG manages).
See, the interplay IS what sells Top Gear. This wasn't true in the Tiff Needell years. It's unimaginable the the ATG hosts, one example, would ever go on "Caravan Holiday" and make it anything approaching entertaining, much less the hilarious episode it was on BBC's TG.