Gnome’s bug tracker is especially tedious, I don’t like bugzilla per se, but Gnome’s one is not even searchable with search engines for privacy concerns (I think?).
Ubuntu + Launchpad is a good combination, mostly because Ubuntu has apport that retrieves logs for you.
What I also like of launchpad is that you can clone the development branch of the software and provide quite easily a link to your branch with the fix in it, which is much better than formatting a patch, and then send it by email etc.
I think many projects would gain a benefit by switching to something like that or even github (or a github clone).
Oh, and I hate that I have to file bugs two times! One for the distro, one for upstream. And then the thread of comments is split in two; it would be awesome to merge them in some way.