Reason for optimism: With several big moves, they won the winter!
Reason for pessimism: They won the winter, just like the Padres and Red Sox did last year, and the Mariners in 2014, and the Blue Jays in 2013, and the Marlins in 2012 ...
Justin Timberlake might have "brought sexy back" a few years ago, but as the list of teams in the blurb above can attest, for baseball bettors, it's usually not a good idea to back sexy.
With offseason additions of Zack Greinke and Shelby Miller at the cost of a boatload of money and prospects, the Diamondbacks are unquestionably this year's sexy pick to crash the 2016 postseason party.