How did Ohio State end up in the BCS championship game?

Sure they ended up being 10-1 but its easy to go 10-1 when you don't play anybody good!!!!!! They haven't played a team in the top 20 all year!! Illinois which beat them at home is expected to get beat bad by USC in the Rose Bowl. The same thing will happen to Ohio State this season just like last season, they will lose big to LSU and the BCS still won't learn their lesson!!