Top bar menu behaviour of xorg programs running in weston is pretty buggy.
With some programs, the mouse might be used to open the menus, they look good, but it´s impossible to cause any action by clicking on the items. A popular example for that kind of programs: thunderbird.
In gwenview and konqueror the menus appear somewhere on the screen instead of being attached to the menu bar.
If I start an old spreadsheet software (applixware), the menus are transparent but attached to the menu bar. After selecting an entry they become opaque and the selected action is taken.
It sounds like most of these issues have been fixed - if not, please file a specific bug for each bug, describing in detail exactly what is not working and what the expected behavior is.