He isn’t bad at all, he’s quite knowledgeable and a more than competent writer. His positive reviews give a good indication of what works in the movies he recommends.
It’s the negative reviews that rub me the wrong way. There’s no middle ground, he either likes a movie or he hates it, and when he hates a movie, which is quite often, he goes to great lengths to criticize every element of the movie and doesn’t hesitate to take nasty personal shots at the people involved in making it. Imagine the lambasting Gigli has taken from the critics being directed at every movie a critic dislikes and you’ll understand what I mean.
But that’s just his style, which I could forgive, though it would be enough for me not to read him. He does however regularly commit a cardinal sin for movie critics. He regularly includes major spoilers for movies he dislikes, reasoning that since the movie isn’t worth seeing, there’s no need to preserve its surprises–he’s doing you a favor by spoiling it for you.
I hadn’t read him in years, so I checked some recent reviews to see if this applies. He gives away spoilers in Identity (and calls people for whom it works “fools”), 28 Days Later, and Owning Mahowny, and is still regularly taking personal shots; he manages to take a shot at Ben Affleck in a review for a movie Affleck doesn’t even appear in.
Unless, of course, you happen to like most of the movies on that list, in which case he’d be a very reliable barometer for which mainstream movies are worth seeing. I’ve seen the bolded movies and liked all of them. Your and his tastes obviously don’t connect, which makes him a poor source of reccomendations for you, but for people whose tastes coincide enough and who like his style, he is a critic worth considering.