Why are some people in the Japanese self learning community so down on Heisig?

Man, I like Ken's blog (mainly because he's a witty writer). But that post was out of line. And I say that as someone who didn't use RTK.

Re: The actual topic - there are a lot of people who love RTK and praise it to the heavens, and that engenders backlash from people who either have legitimate differences with the method, or who just wanna seem like the smartest person in the room. Like everything else on the Internet, it should all be taken with a truckload of salt.