^^ A lot of people said that back in 2000 when they were in the begining. In fact Radiohead was an inspiration as many other bands are (especially Rage Against The Machine, they worship them). The first album, Showbiz, may sound a little like Radiohead but to say that they are a mediocre version is not fair... Then they made Origin Of Simetry wish is very different from Radiohead in my opinion. They even used to mention Radiohead in early interviews I guess, but a lot of people mentioned so much that they are a copy, that they started to get uncomfortable.
Nowadays I don't think they are even close to Radiohead... Not better and not worse, just different.