He was, is, and will be a terrible defenseman that doesn't belong in the NHL. The Habs were f***ing lucky to not only get away with having such an awful player in their lineup, but also to have another team miss the obvious truth and pay them significantly for him. A fluke run doesn't change that.
Source: I'm a Jets fan, and I've seen far too much of what it is like when Chiarot is not carried by a true #1D in Byfuglien. He isn't a NHL level player. As for Monahan, at least he belongs in the league - no question about that.