Never heard of them.

i'm still trying to figure out if this is a serious thread or not. since when do bands break up because they're tired of producing good music?

Well some members might not classify the music they are making as good music, most of the time they'll just break up due to creative differences.
But anyway but yea, this usually happens with not only music but with movies and T.V. show seasons
Like Rocky, what the hell have they done to him...
But yeah, Weezer and Greenday really went down the wrong road.

Probably yeah. Is This It? still kicks ass, although Room On Fire was a good album it couldn't match their debut. Their 3rd album was meh.

The best example from this decade is Hundred Reasons. Their debut album Ideas Above Our Station is a classic, but everything they've released after that is enough to send you to sleep...

Blue Cheer released vincebus eruptum and inside/outside, then turned into a more mediocre steppenwolf.

I thought Room On Fire was their best to be honest. The third one was rubbish though.

Another good example is the Coral - brilliant debut, the followup was a mixed bag and for some reason they decided to get more and more boring from there.

Death From Above 1979 suffered from this to the extreme.

Yeah, Blue Cheer were one of those bands that had one fantastic album and just disappeared completely.

they still tour constantly, and ****ie peterson is still pretty badass. As far as studio albums they only got those two though.

...while I'm here, I'll throw cheap tricks first three records into the mix.