As a promoter of the Shanks-Teach agenda I want Mihawk to be as strong as possible as that will make EOS Teach amazing.
I think Mihawk is a legitimate superior level, like Green Bull or Fujitora but he clearly can't compare to Shanks. He can't stop the MarineFord war by himself, intimidate Sakazuki, bring an admiral to his knees with just haki, want to fight Kuzan and Teach at the same time, etc...
When Oda said that Mihawk was superior to Shanks with the sword the agenda Mihawk > Shanks died, otherwise Oda would have simply said that Mihawk is superior to Shanks.
So Mihawk is very strong he is not a fraud at all but he is not Shanks
I think Mihawk is a legitimate superior level, like Green Bull or Fujitora but he clearly can't compare to Shanks. He can't stop the MarineFord war by himself, intimidate Sakazuki, bring an admiral to his knees with just haki, want to fight Kuzan and Teach at the same time, etc...
When Oda said that Mihawk was superior to Shanks with the sword the agenda Mihawk > Shanks died, otherwise Oda would have simply said that Mihawk is superior to Shanks.
So Mihawk is very strong he is not a fraud at all but he is not Shanks