Had a Lvl 8 on my team that went I believe 2 - 20. We barely won. Get good weapons before you enter the Crucible.
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Don't tell others what to do. You don't need good weapons in crucible. I played with a level 2 buddy with starting weapons and he was too on the team. Don't be stupid and generalize that low levels are no good. Plus people have to play to get better, they won't be magically pro. So why don't you talk the stick out of your ass and be a bit nicer to other new players.