I seem to recall Baseball America and Prospectus labeling him a solid contact hitter with a good ability to get on base and obviously high power grades, but being down on him for anything defensively.
He absolutely crushed the ball last year with minimal movement, I remember being at that Angels series last September when he mashed that HR 450 feet and only stopped because that's where the stadium ended. He also hit a rope to left centre that series that must have been going 120mph! Not sure why he's gone away from that but the sooner the Twins can get him back into that rhythm the better.