Unless you specifically look for people who are at a decent power level and have a mic. If they don't play well enough, you try and help them, and they continue to not play well enough, you kick them in favor of someone who does play well enough. The Heroic mode is meant to be something... well, heroic, as in something for experienced pve players to complete. The more experienced pve players are probably gonna know how to find an adequate lfg team.

Exactly this guy has no clue at all. Everyone of those randoms would suffer. No fun.