I don't expect the Twins to be bad, but to have a chance at the playoffs there are just too many things that would have to go the Twins way. If Gray, Mahle, and Maeda each pitch 140+ innings and Buxton is healthy (can play the outfield everyday) for 140 games things could get interesting.
There is a pretty big range of performance possibilities for guys like Polanco, Kepler, and Gallo with the team needing them to perform closer to the high end of their abilities. Other uncertainties that could impact the team's record are the health of Lewis, Kirilloff, Larnach, Ober, Winder, and Alcala. The Twins would need to get real contributions from most of that group. Basically, if everything breaks the in Twins favor they could compete to win the central, but the chances of that happening are pretty bad.