I can't compare PHX Fleet Service to East Hubs because I have never worked any East cities. I have had the opportunity to work in PHX on the ramp within the past 5 years and after the merger of HP/US. (I wish I was there now and not sitting out on furlough waiting to be called back!)
What I noticed about PHX Fleet is that including cargo and leads, there were about 1000 people in this combined group at the time I was there, and it was a complete fusion of different personalities and mentalities. Full-time, Part-time, students, retirees (from previous careers), commuters, people there just for flight benes, people there dependant on every penny earned and picking up every available extra hour, etc. Mix all that together and you DO NOT have a common focus amongst the group. Everyone has a different agenda and, therefore, beat to a different drum so to speak. As a whole, most people are really good people and quite approachable. There was a union presence and you knew who they were and how to contact them if you needed their assistance. There were stewards available on each shift and the rep was out and about making contact with the employees. It was actually a decent place to work and I look forward to possibly working there again if I get recalled anytime soon for Full-time work.
I think the complex make-up of the population of Fleet employees there contributes to the perception that is "run" different and unique to the other Hubs. I don't know that I support the idea that it is made up of "ME, ME, ME" first. It is just a melting pot of personalities and agendas that there really isn't a shared concept of how it should be. Just my $.02, it may have changed quite a bit since I left a few years ago.