Never have I felt even the slightest desire to slurp down an oyster.  Not once have I looked said bivalve in the eye*, so to speak, and been able to overcome my not inconsiderable revulsion long enough to taste one.  It seems however, that I’m in the minority; many of my dearest friends are completely mad for oysters and eat them in copious quantities whenever they can get their hands on them. 
I bring this up because tasting good (to other people, at least) is a positive characteristic of oysters.  Another positive …