i've pretty much always had good experiences, about four years ago, i think my junior year in high school i would go to the mac counter in the nordstrom in stonestown mall in san francisco and would always get ignored. and the MAs weren't very friendly. they've gotten WAYYY better since then and two of my fave MAs work there now. i love mauro from the sf pro store and monica from the sf saks counter too.
i've always had good experiences, and i've been with MAC since the beginning.
this summer, when i was at the Queen Street store in Toronto, i was lamenting the fact that my foundation - Studio Matte - had been discontinued, and the MA went down to the basement to get some for me.