I've never been to a concert when the band didn't show up, but when I saw the White Stripes, I wished they hadn't shown up, it felt like the longest concert of my life. And the one with the least amount of good songs.
On the Doherty thing - I like his music, well, some of it anyway. The first Libs album was pretty boring, but the second one was much more fun to listen to, with only one or two songs that I didn't like. Babyshambles, on the other hand, are incredibly patchy, there's one, the first couple of songs on Down in Albion that are downright awesome. The rest are bloody awful. Oh, and I'm British, and tired of seeing him drumming up publicity by getting caught doing drugs all the time. I'd say a minimum of half the people who buy his record do so because of hearing about him in the tabloids.
Carl Barat, on the other hand, is much better. He's pretty much just a more consistent version of Doherty.