4. 2006: 6.3 fWAR
This is the only year on the list where Miggy was with the Marlins. 2006 was a great year for the then-23-year-old. He hit 26 homers, which was low for him, but he hit .339 with a 153 wRC+.
It was crazy for a 23-year-old to be putting up the kind of numbers he was putting up. It's hard to believe the Marlins only made the playoffs with him once back in 2003. At least they won it all that year.
This was also the year he hit his 100th career home run — again, at age 23. He had accomplished so much in such a short amount of time. He was already on his way to becoming one of the best to ever do it.