Maybe this is just me, but most of the comments sound like useful (yet harsh) feedback on basic usability issues.

I don't see the obsession with calling this feedback harsh. I'd kill to have the feedback shared on this site (it's not like you are obligated to listen to anything), and it doesn't offend me in anyway. I actually like when people get straight to the point.

If someone were to have a mightier-than-thou attitude when giving the feedback, then maybe that would throw me, but I would more likely get annoyed because feedback from people like that tend to be redundant or just complete shit.

^^that's Marc Andreessen FYI, those of you downvoting him.

So? If his argument for why this is good is that it's "killer" and from "legendary engineers" then he deserves it.

It is always easy to shit on someone else's product. But it's still a net benefit, in a pile of shit they may find a gold nugget of a comment or a suggestion.