Maurice Jones-Drew was a pretty good NFL running back in his own right so does that mean that he should have a better perspective and more educated opinion on the quality of current players at the same position? The beauty of the answer is that Jones-Drew has the right to any opinion he so chooses and so does anybody else who reads an article about opinion-based rankings.
Nobody can argue with a ranking that is simply a list of running backs, ordered by rushing yards. Rank by opinion and you’ll soon know how many people share it.