Hunters do fine in groups.
Actually any class does well in groups, depends on the person behind the keyboard.
That being said, I have noticed that almost any class that "Prefers to solo" gets somehow labeled as being not group friendly.
I often attribute this to the fact that often an easily soloable class often solo's and when in a group TRIES to keep using the solo techniques. Often this leads to the group getting killed off and therefore labeling the soloable characters as "Non-group friendly".
Case in point, last few hours of Beta we had a Hunter that would just pull, not informing anyone he was pulling, would often wander off and pull, only running back to the party when he had too many to successfully solo (adding to the ones the party had already pulled) and generally getting the party a nice little wipe out. After a bit people began to mutter how Hunter's were just not good group classes.
My guildie Hunter on the other hand, never did any of these things, often used the pet to control adds, was on the spot with wingclip and concussive shot on mobs that tried to flee. He was a definite assest to the group.
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Ashnak-Orc Hunter, Bloodscalp
Ashnak-Gnome Rogue, Shadow Council
"Everyone Salute Capt. Asshat"
-Cardiak