I grew up and to this day don't particularly care for unions. Having said that, I can not imagine working for AMR Corp. without having the protection of ALPA. I have never once (in 8 1/2 yrs) been called to the office for disciplinary issues, but have seen many who have. Some earned it. Some didn't.
Also, I have volunteered on the Aeromedical and HIMS Committees for six years, and can tell you that the ALPA Drs. are second to none, and HIMS
HIMS - A Substance Abuse Treatment Program For Commercial Pilots really helps those in need. I have gotten back more than I've given.
Bottom line- you (and your pilot group) get out of your union what you put in.