It's going to be hard to be objective here because I just don't trust Belichick to feature Ridley like he did last year. It's very likely, but I just don't trust it. Not to mention his upside is capped in PPR because he doesn't catch passes. Vareen, Bolden, Blount, Washington, a lot of capable backs they've piled up over there and before Bolden hurt his knee and got suspended last year he was getting his fair share to go with Ridley/Woodhead. Just a sketchy situation in my mind, he won't be on any of my teams unless he falls farther than he should.
That being said, Ridley is going 20th on fantasyfootballcalculator in Standard, which is 2nd round, I think he's more of a 3rd rounder there. In PPR, I wouldn't want anything to do with him until the 4th.