I agree with The Cure, even though they're one of my favourite bands. If they had quit after Wish they would have left a near perfect legacy. Instead we now have a middle-aged Robert Smith who's far too old to be wearing lipstick and releasing middle-of-the-road albums.

If U2 had quit after Achtung Baby i might go as far as to respect them.

311 needs to realize that they're all 40 and should no longer be singing about how "Guns (Are For Pussies).
Alice In Chains should have never gotten back together.
If Blink 182 called it quits after Dude Ranch (or maybe even Enema Of The State) they might not be looked at as such douche bags.

There's a separate endless list there. :p:

Agreed. I liked them up to and including Enema of the State (which I actually liked better than Dude Ranch).

I agree about 311 too, should have quit after Transistor.

Manic Street Preachers. They stopped being "4 REAL" a long time ago

Oasis
Supergrass

Two that immediately come to mind.

Elaborate?

The new album certainly isn't up to par with B,S and CFUTF but it's still a fine record, albeit a lot less aggressive. The only reason I think someone would think they need to stop making albums is if they're an absolute purist of their early, darker, purely post-hardcore stuff.

I disagree. I know they aren't popular around here, but I consider myself a big fan and own their discography. Their earlier stuff is awesome, but I love the direction they've gone recently too. Don't Tread On Me (2005) is actually my favorite release of theirs.
I always hear people talking about how good Transistor was. It's not bad at all, but honestly, would be near the bottom of my list if I ranked their albums.

I won't say I'm a purist, I just don't like the new one much and feel they can only go downhill from now on. But I guess it is a little early to tell, as I did like the first 3. So, I take it back...for now. :D

The Stone Temple Pilots are working on a 60s album. I'm actually really excited about it, but if it sucks, I say the Stone Temple Pilots.
Queen should have quit after the first album post FredMerc. Heard We Will Rock You on a Disney Channel commercial while babysitting and laughed 'till I cried.

I disagree with RHCP even though their last album was a misstep, I actually hold Callifornication in very high regard and quite liked By The Way.

I do agree about U2 post Atchung Baby and I DEFINETELY agree about The Rolling Stones.

Metallica's last good album IMO was The Black Album, had they ended there they probably wouldn't be as despised as they are now.

I don't agree that Genesis should have ended with Gabriel, I quite like the Collins stuff so IMO they should have called it quits after Invisible Touch.

As for the prog bands, actually I'm always happy to see a prog band still together after so many decades, they're all in their 60s and 70s now, playing clubs that are a thousand times smaller than the arenas they once played, it's kinda sad, but also inspiring that they still have the desire to keep making music they love even long after their commercial appeal went away. IMO Yes and King Crimson still have some good albums left in them and I'm genuinely excited when they put something new out. I can't say the same for other prog bands but I'm happy they're still around.

I don't really like to say any band should break up though, it's a miracle when any band can stand to work together after so many years and if they still enjoy doing what they do then I'm not in the position so say they should break up just because I dislike their new stuff, I can just easily not buy it, a lot of people will still eat it up so whatever.