Injuries aside, he is virtually "bust-proof" in PPR leagues.
Receptions are probably the single most difficult thing for a running back to maintain over the course of a few years, especially when they're not specifically a "receiving back" like Reggie Bush.-Steven Jackson was a 90 catch guy in his breakout season. Then 38 the next year, 40 the next year, and he's stuck around that for the majority of his career.
-Ahman Green was a 70+ catch guy. Within 2 years he was consistently catching in the low 40's every year.
-Shaun Alexander was a 60+ catch guy when he broke out. That immediately dropped to 40 the next year, then 20 the year after that. By the time they made the Super Bowl, the O/U on his number of receptions in the game was 0.5
-I think everyone remembers LT catching 100 balls in 2003, what about after that? 53, 51, and so on the next few years.
Ray Rice's 78 catches for 700 yards last year are a HUGE part of his top 5 ranking. That actually makes him MORE risky, not less, because you're paying for something that's difficult to repeat. Historically, those type of receiving numbers are almost impossible for a running back to maintain, or even to repeatedly come
close to.
It's a bit silly to say that Rice is bust proof because last year he did something that almost has been able to repeat after doing it themselves. I wouldn't be in the least bit surprised if Rice catches ~45 passes for ~400 yards next year. That's 90 fantasy points (the equivalent of 15 touchdowns) lost right off the bat.