I love that when I need to throw something together quick its there waiting for me. Its commands are discoverable. It has a sane API that has led the awesome bzr-svn, and the rather delicious bzr-loom plugins. Where others have frustrated me, Bazaar has been there and has just worked.
If you want to join in the goodness, you can now grab a bazaar branch of any GNOME module trunk with ease, thanks to the bzr mirror I have been working on. It should normally be more up to date than launchpad, and is bzr-svn compatible – so you can push your changes back to svn.gnome.org. There are even some nifty instructions.