If rangers are getting kills on mordris etc in your world then your rogues must be very incompetent dps...Why bcuz you cannot construct a solid build? If someone/some people are getting kills then explain where the issue is? I'm actually hinting at some thing that I wont delve into but something your saying is completely incorrect. Deal with it instead of popping into other servers watching them.
Maybe you are talking about necromancer, since him being resistant to poison, shadowstrike and poison weapons of rogues become obsolete giving rangers an upper hand.