If it's a specific question that can glean a specific answer then yes, it might be an appropriate question.
Even "Does QTP do bitmap comparison better than Selenium" is on shaky ground because it's asking for a subjective answer. The question, IMO, really needs to be formulated more along the lines of
Which is the appropriate tool for bitmap comparison, QTP or Selenium?
I need to perform bitmap comparison and the two tools available to me are QTP and Selenium.
Which is the most appropriate tool and what are the technical reasons for that?
That said; I'm still not particularly happy with the way I've phrased that (although I've managed to remove the word better which is the bane of subjective questions), and even carefully phrased questions still stand the chance of turning into a "heated debate".