I saw Miggy hit a HR last year and immediately got a little goose bumpy thinking "This could be his last HR here" or "I might have seen him hit the last HR in person".... things like that.
If the team were in contention and winning games mattered to get into the playoffs, then yes, you could argue it's better to put a less crappy guy in the lineup. But he's not going to block anybody good with his at bats this season.
Miggy is the best position player many of us have ever see in a Tiger uniform.