Not bad at all actually. Certainly, the protagonists chemistry is nowhere near the original trio, but they compensated for that making a lot more of a "car show" actually. The new car in the Star in a Reasonably Fast Car was a great addition, McAvoy was a great first guest and the interview and all the segment went along well.
LeBlanc and Reid do their best but they certainly don't have the charisma of Harris, which reminds of a younger and faster version of Clarkson. I don't want to compare this to Grand Tour until the season finishes, but this first episode has been better than some Grand Tour episodes.