FWIW, Bill James has Mauer's "HOF Score" at a 66, where 100 is a HOFer. I think the scores are somewhat low as he only has Miguel Cabrera at 96 and I would say he is a lock. Baseball reference's top comps for Mauer by age is Victor Martinez. The first name that came to mind for me was Bill Madlock, a guy with a bunch of batting titles but less than eye popping power and RBI numbers. This is a dankind-ish thing to say but at this point in his career Mauer would be a very underwhelming HOF candidate in my opinion. None of his accumulative numbers will likely scream out HOF, it will be his slash numbers and "new" stats like WAR, OPS+, etc. On the other hand there are a lot of what I would call mediocre players in the HOF already so if you want to compare Mauer to recent inductees Dawson and Blyleven I think he is a better player than them.