These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Broken Base: After the band refused to let their songs be featured on Glee, their fandom experienced mild turmoil over whether or not it was a good thing.
Covered Up: The band's cover of Gerry Rafferty's "Baker Street" early in their career is the closest they have come. The original is iconic for its saxophone solo. The band simply converted the melody into guitar. The cover isn't that well known to have completely replaced the original however.
Dave Grohl. In fact, the first album was made completely by him, with the help of a producer and only the guitar part in "X-Static" played by another musician (Greg Dulli of the Afghan Whigs).
Dave himself was on the other side of this trope with Nirvana. Nirvana was Cobain. Many people wouldn't even know Dave Grohl was part of it.
Though it has to be said, Taylor Hawkins is almost as popular as Grohl now. This is evident in the crowd reaction for him, when introducing band members, Grohl only has to say 'the drummer' and the crowd noise will drown out anything else he says.
Whilst they sell many records and play arenas in their native US, their popularity there is nothing compared to that in the UK, where in recent years they have sold out massive outdoor shows in minutes, months in advance. By Dave's own admission, the UK treats them like they are "the biggest band in the world", and while he can walk around cities like Los Angeles largely unrecognized, he gets mobbed on the streets in the UK.
This also applies to the song 'Wheels' according to Dave who has mentioned on several occasions that apparently Germany is the only country where they can play the song with the crowd singing along. While most American crowds tend to be bored and most Asian crowds not to be bothered with it.
Their reputation in America has a tendency to be "That one band the drummer of Nirvana made." with a certain group of people. This isn't to say that a lot of people know them on their own, but several people basically think of them this way.