I have a long laundry list of issues, but it really came down to: Every few months I ended up spending a whole day fixing the server for one reason or another. I wasn't expecting the server to go down so much. Gitolite is a excellent counter example of something very simple you can set up, keep upgrading and it just keeps working.

After the fact that it was more effort than expected to keep it running I found the UI frustrating and annoying. This was all part of the reason I started GitHaven.