Then "radio friendly" is a bad thing I presume? Should they litter their music with excessive profanities and sing about f*cking hoes and how George Bush is a bastard. The only thing that separates "radio friendly" music from the rest is the fact that it is popular enough to get lots of play. Even un-radio friendly music gets edited and makes it on the air if it is popular enough. Being popular has somehow become synonymous with being a sell-out or being formulaic (I realize you didn't say all this, I'm just throwing it out there).
And I agree with you that many Foo Fighters albums are full of filler, but the hits from the albums surely overshadow it. While there are some CD's where every track is a gem, they are few and far between, regardless of genre.