This article got me to check out the radio documentary mentioned in it, "Cheiron - en popsaga". It's quite interesting, if you understand Swedish.
I won't say that I enjoy Max Martin's music (although I loved Milennium by the Backstreet Boys when I was a kid), but I do respect these guys for what they do. They are master craftsmen, and of course it's not easy to do what they do. I simply accept that their music isn't written for people like me, and judging it for that is silly.