Mihawk is a legitimate top tier. He is the WSS in a manga with Rayleigh, Fujitora, Shanks, and Cracker. He's also Zoro's final villain.
Mihawk's haki > Cracker's haki (cut G4 Luffy) >>> Doffy's
and Mihawk doesn't have a weakness like Cracker is implied to have with his base body having low pain tolerance.