people are monsters solo'ing, never learn group skills
then when they're "forced" inside to do the group instances they don't have a fucking clue what to do
What I have noticed post 40 is that in groups my DPS is lower than most everyone else. Now I have 162 AGI atm, with a Raptor rank 5 in all skills, one of the best bow's for my lvl and I still put out less DPS than all the others. Now sure my DPS is constant, but it's still far less than say adding another Rogue or Mage or hell even a ShadowPriest.
Plus we don't really develop any later skills that help in groups. No pulling skills, no crowd control, very little stunning (yes it was knocked down per Blizzard via last patch) and ATM 2 of our aspects are bugged.
Don't get me wrong, I really like my hunter. But I just really hate that the tradeoff for solo ability vs grp ability is so great. Hopefully Blizzard will go back and do some fine tuning for the class once they can keep the servers online for consecutive days.