Its season 4 which hasnt aired in the UK yet but what a corker of a season it was, this show just gets better and better and it has also been confirmed that there will be a further two more seasons, cant wait!
I didnt think it worked having the Hoff myself but as it was such a minor role it didnt have a huge effect i thought. Its odd as all of the other guest actors (Tom Arnold, Adam Arkin, Ally Walker, Henry Rollins etc) have all been great, superb show!
Oh and yes you are right, the latest season (4) is currently being shown in the UK, i didnt think that it had started to air yet, my apologies! I may watch it again it was that good!