I wouldn't like this trade if Quintana was repeating what he did last year and there was no reason to wonder if there is some problem from which he will not recover. If the Cubs are lucky with this move, and Quintana returns to his form over the last few years, the best case reasonable scenario is that he helps the team make the playoffs this year and they check out of the playoffs quickly, while also giving them a nice, strong mid-rotation lefty for the next few years.
That is not much of a return for a potential true top of the rotation starter and a potential multi-year middle of the order powerhouse outfielder.
Not at all a good move.