I personally haven't been unhappy with ADPi, itself. I have always loved and respected the org as a whole.
However, there have been issues with specific people in and associated with my chapter (advisors). To this day I still feel my blood boiling when I think about certian incidents with the chapter.
I wanted to quit more than once, and now as an alumnae I am very glad that I didn't.
It took a while to realize that there are some people that I would just never agree with and probably never get along with, and thats OK. Just because I didn't get along with someone didn't mean I had to be miserable around them. With the help of a few really great sisters, I was able to end my collegiate years on a happy note. Now, I really miss my chapter, even with all of the rough times.
I hope that things get better for you. Just remember its going to be what you make it. If you let people get you down then you won't have any fun, if you own your time with your chapter and do good things with your time...you'll be much happier while you are there.
Hang in there.