I really thought Cal Ripken would be the first unanimous Hall inductee, and I lost a little respect for the Hall voters when he didn't even eclipse Tom Seaver's percentage.
That said, as a lifelong Red Sox fan, I think Mo deserved it. As others have said, he is an exemplar not only on but off the field. And as Jordy pointed out, he's the only player that I can think of who's CLEARLY the best ever at what he did. I think for a very long time there will be conversations about who's the second-best closer ever.