Its very rare to see well geared people to not know their class.

People are badly geared in the first place because tthey do nnot know their class iin the first place, there aare also badly geared people that THINKS they play better and make that as an excuse of their terrible gear.

You do not nneed double melds on most stuff, people that says that are mostly tthe one that have yet to beat tthe content and use it as an excuse of their either lack of skill , basic raid layout, or party sync.