1. opmaC_asiM_ssiM(Not someone's name... can't get banned)=Mods/Lagswitches/Boots
2. Retard team members who run out in the open and/or give out free kills.
3. Team members who aren't playing just giving away free kills/ not helping.
4. Getting level 12s who have never even played PvP on your team against three lv34 no lifes.
5. People on your team who are friends with the other team so they give them free kills and give you away.
I don't know if much can be done about those problems but those are the only things I hate about Skirmish, and the rest of PvP for that matter.
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If you're playing Skirmish, Salvage, or especially Elimination without a party of 3... you're going to have a bad time.