I do find him funny, but do agree with a lot of what Tim says -- he's too mainstream which, for me and lots of other comedy 'snobs', is not enough. Unfortunately, mainstream means more commercially-viable and hence the comedy becomes stale. At the end of the day, Stewart Lee's done very well to get a TV show given his style.
That said, don't deride the people who like Michael McIntyre. At least they're not watching soaps and reality shows -- the real reason the country's full of idiots...
Dan