Well, there are really two kinds of pimping. There's the kind where the questions asked are relevant to patient care, and then there's the kind where the questions are ******ed, not related to patient care, and are designed to be missed.
The kind or kinds used by attendings and residents, of course, depends on the individual doing the asking, but if the questions are related to patient care and practical medicine (no matter how difficult or abstract they may be) then I'm all for it. It's valuable education and sometimes a worthy challenge to boot.
That being said, I absolutely hate attendings that base their pimping on questions dealing with subject matter that's, in effect, useless and impractical. How is that supposed to teach you anything but humility? And who needs more humility?! Medicine by its very nature teaches that all the time.