As was mentioned, he had a tremendous rookie season and he did help us win a Super Bowl...so...?
I get some people would have preferred Chubb but while hindsight is always 20/20, Michel has been a pretty solid pick up. With Brady gone I expect him to get more of a look in the passing game. Say what you want but the guy is pretty good in the open field when he has the football. If he can get more involved, it would certainly change things as defenses would hopefully no longer be able to key on the run, which is essentially one of the biggest problems (along with the offensive line injuries) he had last season.