I really don't think Frank Mir's abilities are over hyped as much as his profile is always noticeable to do his self-promoting. I haven't seen anything on this forum or others that argues for Frank Mir being the de facto champion or dominating the division. I think the consensus is that Frank Mir is an elite heavyweight with a big mouth who has the potential to be champion.
I tired of people downplaying his first win over Lesnar. The truth is there are very few people in the division who could have pulled off what he did to Lesnar.