'Roleplaying Game' is one of those awkward genre labels meaning different things to different people. I don't have a good personal definition, but one element I consider to be at the core of RPGs is questing.
It's a little contrived, but somehow I love being bossed around and completing tasks for people. Preferably something more involved than being asked to kill ten wolves, but World of Warcraft is the only game I've played where grinding quests were quite so ridiculously blatant and over-used. Usually quests are a bit more interesting, and reveal pieces of the world and its inhabitants I wouldn't see otherwise.
I'll usually happily do whatever characters ask, even when it gets silly. I'm supposed to be on a critical mission, but apparently still have time to rescue someone's cat, or run an errand. I don't usually question it much. There's a time to question game conventions and motivations, and a time to just be satisfied that I'm enjoying myself.