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It's a shame that the "Shit HN Says" Twitter account is dead. This would be a dead cert to end up on there.

In all seriousness, from a highly abstracted view, Dropbox isn't all that complicated. However, the same things are said about numerous other projects. I remember when Stack Overflow took off, and everyone around here said "I could build Stack Overflow in a weekend".

It turns out that, yes, you can build Stack Overflow in a weekend. However, all you've managed to build is a basic Q&A site. What you've missed is practically everything that makes Stack Overflow work. The rep count probably doesn't work as well, the moderator controls aren't there, the OpenID integration isn't there, the markdown controls aren't as sophisticated, it's slower, etc.

I don't have a link to it, but not long ago there was a repost of the original "Show HN" for Dropbox, where there were similar criticisms of how "trivial" Dropbox is to implement. The devil is in the details.