I am in two groups - one a guild, and one more of a bee, I guess.
The guild has its positives - we have a program nearly every month, do a show every year, contribute children's quilts for the local emergency responders to give out, etc.
The bee is small - about 10 people usually. We learn techniques, work on charity quilts, and take an 'each one teach one' attitude. I like this one a great deal.
I think you get out of a group what you put in, so go with an open mind, and volunteer to help where/when you can. Usually you meet a lot more people that way, and become a part of the group. You can help make the group friendlier to others, sometimes.