A lot of good comments and advice here.
I tend to think it was said nicley by mobowhuntr-
"If you shoot 3" groups, that sounds pretty consistent to me.
Some people are just harder on themselves than others, and demand more of themselves. Nothing wrong with that. Set your personal goals and achieve them. "

I for one try to get the tightest "groups" possible and will tweak until I am happy with the results. There are too many things that can increase the margin of error in a hunting situation not to have my arrows landing whereI want them to while practicing, in the backyard standing in the proper stance with as perfect form asI can achieve.
A lot of things don't mimick the backyard while hunting, the angle of the shot, footing on the tree stand, location of the target (never just right- pesky deer[8D]), limbs or branches to navigate around, SITTING shots. All of the comfort of backyard shooting seems to disappear while hunting (for me anyway). Therefore I will try my best to ensure my equipment is performing as good as it can so the rest is up to me.
3" groups with broadheads consistently sounds very resonable to me. The amount of arrows in the group obviously will increase the size of the group.

BTW, I'm not sure about anyone else, butI sometimes use the word "Group" when describing my shooting when in reality I'm measuring how far the arrow is from the point of aim (center of spot), especially when reffering to broadheads. IfI shoot 3 different heads at 3 different spots and measurefrom the center of the spot to the outside edge of the arrow furthest away from the center, that is what I am calling a group. I guessI might have misspoke? the results are the same IMHO, just cheaper this way..