JSF is not perfect, nor the greatest thing since sliced bread. There, I said it!
What bugs me most (and remember, I'm still a big fan) is that JSF was supposed to be really easy-to-use. But the reality isn't quite so sweet.
Adam goes on to explain a few of his pet peeves with JSF. He also asks "What are your biggest JSF usability concerns?" If you're using JSF and experiencing usability issues, now's the time to speak up.