I´ll put aside the fact the Nirvana´s singer was a pathetic, sorrowful individual, barely average as guitar player, possibly marginally better as singer...but being a fine musician is not what really matters; the requirements in the present day world to become something they call "celebrities" are of a different nature (barely literate, drug addict, alcoholic, lowlife, etc.)
I´ve been to Seattle several times after the year 2000...and met guys who were in their late teens/early twenties when this whole Nirvana crap "took over" MTV. They laugh, literally, about what the whole thing became...they refer to the so-called "Seattle Grounge Scene" as a bad taste joke...Seattle was not different to what most medium size or large cities in the western world regarding the number of bands performing in bars and night clubs can offer...95% being bands that suck big time and only a minority of real good ones...but just because MTV got there and found a group of junkies which by the time fit into the category they thought would supply them with what they were looking for....also i was told by them the real fine bands of Seattle did not have the "luck" of getting hand picked by MTV.
The Grounge musical style and the ultra-boring so called "Seattle Grounge Scene" were to the largest extent the new marketing tools MTV found to come up with something that would be "new"....Nirvana....ever heard of Sonic Youth?
The smarty pants at MTV had commenced to notice the heavy metal trend which they had supported, fostered and broadcasted to levels of insanity during the second half 80s had to be replaced by something "new". It is not daring to say that to some extent they got tired of those heavy metal bands who had chicken hair and that wore clothing that made those poor guys look like low-budget corner prostitutes of a slum located somewhere in LA.
Something so "new" and so "good" had become utterly necessary, so they sent their scouts out and began contacting people everywhere...music freaks all over the world would then literally attack record stores to buy the albums of the "new" bands...