I agree with a folder that syncs. Today I use dropbox, but I do my best to avoid interacting with it, because just clicking on the menubar icon makes me upset that no feature there is what I actually need. No sensible ignore rules, etc.
But I could have been wrong and focusing on dropbox was not the only path. But even if it wasn't, they fumbled every promising product they could. I mean, Mailbox, they pioneered (read acquired) the email swipe UX, then killed it.
Then there was that launch where they hyped some iCloud sync service that would allow apps to store settings and game states, etc. Whatever happened to that?
Today I'm so afraid that dropbox's more daring products will die faster than Google can retire theirs, that I simply do not use it for anything other than a folder than syncs where I can share links. And now that I think about it, it's been a while since I had to share a single link, so maybe I can just move to synching.