As others have said, the chemistry will take time to bed in. By the looks of it, two presenters will be hosting the standard 'backstage after show show' on bbc 3. Probably a good turn given those two have hosted youtube/online pieces of their own.
As for the LeBlanc/
Evans bits, I actually felt that LeBlanc was good. Evans though, as much as I want him to do well, did seem a bit too much like trying to mimmick Clarkson, though he has always been loud and brash. His shows always seem to be loosely held together with weak links.
The celeb interview with two disjoined guests was awkard at best & really getting Ramsey to show off his latest key whilst well meant just made him seem arrogant. It would be better if they either interviewed duos with a reason, or go to one per episode.