I think Bugzilla is an example of a web application with an extremely badly designed user interface - I find it very frustrating to use in general with unclear

I think Bugzilla is an example of a web application with an extremely badly designed user interface - I find it very frustrating to use in general with unclear navigation and excessive clutter. Compare it to trac, an application that has basically the same functionality yet is a joy to use (e.g http://trac.edgewall.org/ticket/6614 http://trac.edgewall.org/ticket/6614)