Perhaps when registering in the lobby (apparently, that's where you meet, where else) you could set checkboxes like "just installed," "watched streams," "familiar with HeroesWorld rules," "longtime HeroesWorld user," plus a readme on HeroesWorld rules — simplified, in 2..3 paragraphs in large font. Then these checkboxes would show who's from where.
Good and bad player — never use such words, it's politically incorrect. And among those who play HeroesWorld, they'll figure out for themselves who's top and who's a downer (oops! incorrect again). Without that, IMO it's impossible to find an adequate player in the lobby.