I think on paper, they're weaker than last year...but I think they also underachieved a lot last year due to a bad bullpen and fluky bad clutch stats. Baseball Prospectus' adjusted standings report indicates they could have been a 74-76 win team last year if they had not run into so much negative variance.
With an improved bullpen, better luck, and the chance to improve as the season goes on as prospects make their debuts, I'm going to go out on a limb and saying 72 wins.