I'm not the hugest Foo Fighters fan, but they have some good stuff.
Never tried their debut.
Colour and the Shape is definitely their best, and quite a solid album.
Nothing Left to Lose has a handful of good songs.
One by One would be my second favourite, and I think is almost as good as CATS.
In Your Honor is a tremendous mixed bag. When I listen to this album, I always get the feeling that Dave had written about six or seven softer songs and three or four heavier ones, and didn't want to make an imbalanced album. So he thought up the double album concept, and wrote the rest of the songs in one day just to fill the rest of it up. Many of the songs on the louder disc seriously sound like he wrote them in five minutes. The softer disc is much better though, and IMO is where Dave really had his heart on this album.
I gave the latest one a try, and it seemed totally boring and uninspired to me.
Also, their version of Have a Cigar with Brian May (I think it was?) was pretty cranking.