I can't speak from experience, but I can only imagine that making a short movie in a few months time, with a small team, and with Ton as your boss can't be easy. Add to that the sometimes harsh criticism from within the community, and it must at times be downright hard.
When you leave a comment on the internet it's easy to forget that real people will be reading it, and that it may be interpreted far more negative than you intended - I've been there (peace, hx8? :-).
I'm not saying that you can't leave proper feedback, just think about it a little before you post it.
And now, a word from the Durian team themselves!
The following video was taped a few days before the release of the Sintel trailer: