I can't say that I am a great fan of his personality, but his reviews indeed are decent. The main thing that I like, though, is that he is giving you an uninterrupted take of how the car actually drives - the way you would wanna drive it and on the roads you would wanna drive it on. This gives you a lot of additional information you'd otherwise be missing or that might get lost in translation.
Also, since we are on the subject, at some places he's been criticized for "driving too fast" - which I think is ridiculous. I have watched a fair share of his videos and never once have I seen him driving in a dangerous way. Most of the time it's some near deserted canyon road and even then he always properly slows down when approaching blind corners, never drifts the car and generally is reasonably careful. Is he driving way above the speed limit? Yes, no doubt, but that personally doesn't bother me in the slightest.