Taste is intensely personal, and everyone gets their own.
Impact on the genre and on culture in general, however, is an more objective thing, and by that measure, Gibson is a giant.
> I never understood why Gibson has been written about so much when his output is so little.
As a huge science fiction nerd, I get impatient for new mind candy, too. But I far prefer a few stellar novels to a stream of forgettable pap, and by that measure, Gibson also over-performs.