Good or bad thing about him is if you've read one KV book, they are all pretty much the same.
Because a story about the chance meeting of a science fiction author and an insane used car salesman is pretty much the same as a story about the entire planet repeating their lives, and a story about the journey of an ex-billionare around the solar system as a result of bizzare "coincidences" etc etc.
I mean, stylistically, he is pretty consistant, and in Slaughter-House 5, he toys with some ideas that are also in Time Quake, but considering how deranged his novel plots are, its a bit silly to say they're all the same.
Also I read Welcome To The Monkey House a few weeks ago and it was pretty awesome, but did anyone find it weird that there are all these fantastic, bizzare stories, and smack bang in the middle is just one of the sweetest love stories you've ever read?