I've always thought they should sell specialty drinks by weight. I'm sure they're meant to be standardized, but they're really not.
At our local book and coffee store there's one guy who puts in a ton of foam and another who puts in very little foam. I swear I get more coffee buying a small latte from low-foam guy than I get paying for a large from lotta-foam guy.
I've tried asking for less foam but apparently he's just not capable of filling the cup more than half full of coffee.
I just have to get plain coffee or something iced when he's on duty.