What is the largest discography by an artist/band you consider flawless?
What do I mean by that? What artists/bands do exclusively have albums that you consider great - not necessarily 10/10s, but close to that, not a single album that you would consider "meh". This is easier for artists that did not release a lot - sure, I guess I would say The Postal Service only have great albums, but they only have one. I can also think of a few two-great-album-bands (e.g. Joy Division), but it gets harder and harder with larger discographies. Many of my favorite artists have many great albums - but also weak ones (Radiohead, for example, is definitely not an example of "only great" in my opinion, the Beatles aren't either).
I am having a harder time thinking of artists with larger discographies and only great albums. Portishead (3 albums) would be one, maaaaybe LCD Soundsystem (4 albums) could be considered, but that is already a stretch for me. What do you think?