Let's play our old game from Sesame Street..
Which of these things is not like the others?
Those are Mora's OPS+ numbers from the past four years (if you don't like those fancy newfangled stats, here's batting average:
.275, .250, .233, .317
Mora's not a bad option as a utility player and 3B will add to that value. But, remember that Mora played significantly above his head last year and much of the increase was in batting average (55 points above his lifetime average), which often signifies a freak occurrance. Of course, 3B has a pretty big drop-off, IMO, after the best players, so Mora could be decent even if he drops off. But, I'd be surprised if he hits more than 15 HRs this year.