Web cartoonist and blog punditarian Hugh MacLeod dislikes many aspects of Web 2.0. We share his pain, but not his taste in metaphors. No. 2 on his list:

The endless train of online armchair quarterbacks endlessly trying to engage you with endless rounds of mental masturbation.

Items 1 and 3 through 10 are much less disturbing, unless you're into quarterbacks. Not that there's anything wrong with that. [Gapingvoid]