Seigler's articles usually enrage me, but this one isn't so bad. He makes a mix of valid points and (IMO) less valid ones. If the Store crashes as much as he says it does, that's a huge failure. On the other hand, complaining about the alert box the Flash Player popped up struck me as particularly funny- of course that wouldn't have appeared on an iPad. It doesn't have Flash.
I think the MS tablets (and they are tablets, despite Seigler saying they aren't because they're the "wrong shape") are between a rock and a hard place. On one side, the locked-down, user-friendly world of Apple. On the other, the free, tweaking, custom ROMing world of Android. It's trying to sit somewhere between the two and I'm not entirely convinced that it can.