According to a GM that was talking before wipe (forget who, and it may not be the same now) Accepting as squad only shares the reward, not amount of kills, etc.
I would not mind this if a group got a quest to kill 10 bots, then you go out and kill 10 for the squad, or even having to kill ten per person in the squad, but it ends up needing much more kills.
Before wipe i was in a squad of 2, we had to kill around 30 for each of us to get ten each, it was because the other person was a combat build, i was a merchant build with minimal weap skills. if they tagged it first or did more damage (not sure which) i would not get credit for the kill.
As it is it is pretty useless and yes, far as i can tell means it is better to fight solo than in a group.
Who the $#@% is stEvE?