"Bleach lacks consistency"
maybe you meant to say there is nothing impressive about Nevermind. If you know anything about Nirvana, you know that album isn't even close to being the best. and you also know that kurt hated smells like teen spirit because it was sort of the sell out song.
Technically speaking, there is nothing too impressive with you
Hahahahah...you're one of those die-hard Nirvana fans. You're probably one of those second generation Nirvana fans that was in fourth grade when Nevermind came out? Going through Nirvana's extensive catalog I would rank Nevermind 2nd behind In Utero.. Bleach is good and raw, but lacks overall consistency. Their other releases (Insecticide, & Unplugged don't count because they're just covers and live takes. And if Kurt Cobain was so concerned with selling out why did he sign with Geffen? Seems like if he didn't want to sell out he would have kept the band under the Sub Pop label. Oh well, he couldn't handle the stardom that he so desperately wanted and he ended up blowing his brains out. At least it allowed Dave Grohl to develop his full potential.
Don't get me wrong. I like Nirvana and I liked them back in the day, but musically they were not that talented. It was more of a market niche that they hit upon with those unruly haircuts paired with torn jeans and nice sweaters.
"Insecticide, & Unplugged ...
[are] just covers"
"Geffen ... Sell out"
Jesus, these are not serious indictments of ability. When I listen to Bleach, and every other Nirvana record, I still enjoy them and appreciate new things. Refresh my memory, but didn't Nirvana guitarists come and go? Throughout, Dave G offered spectacular drum work -- on all albums, esp on In Utero. And Kurt's guitaring was fine, just fine. As one example of Kurt's guitar ability, most fail at playing L2 (I think that's the name), a song on one of their cover albums.
Most importantly, they strike a chord. Nirvana has influenced tens of millions of people, and still informs millions to this day. That's talent: undefinable and transcendent.
Whether or not they played/recorded covers, signed big label or demonstrated "inconsistency," Nirvana is a fine example of talent. I regret that, whatever the reason(s), you choose to impugn the band with analytical reasons why they are no longer good enough for you wear them on your sleeve (or wherever).
In five decades, their music will remain influential (unless the global climate crisis has his way).