Even before github was around, sourceforge was a PITA. I remember clicking through the web UI for more than half an hour before finding the place where you could configure the project website/homepage.

Also, trying to delete an abandoned project, which had a mailing list, but it wouldn't let me delete the mailing list, because there was still an admin in there (me!), and I couldn't leave the mailing list, because then it would have been without admin. D'uh. And you couldn't delete a project with an active mailing list...

Then a few years later, after I didn't use SF much anymore, I tried to comment on the bug in the bug tracker, and didn't find any option to do that, even as a logged-in user.

I used google code as soon as it became available, because it worked, and had a much cleaner admin interface. Not to mention user interface.