Heh, that is one way to think about it I guess, saying he couldn't handle the fame. I doubt that is the truth though. I highly doubt he was like, "Holy shit, I'm too famous, how about I just get really fucked up on drugs, then kill myself. That way, I don't have to deal with it!" Not likely.

They might not have been the greatest band ever, and I don't know if you are somehow involved in the decisions it takes to sign a band to a record label, but I'm sure they had just a little more than a few catchy riffs if they made it that big. There are plenty of different music styles out there, so I doubt they were just looking for the next new thing by chance. Truth is, although you might not have liked his music, vocals, etc. a very very large mass of people did. And clearly enough to make them a highly popular group that made successful album after successful album.

Don't get me wrong, I'm not one of those all impressed individuals that cried when Kurt killed himself, but I do like a lot of their songs. You don't have to be a guitar expert or a song writer to see talent, but it can help.