This list has had quite a few changes since the start of the season. But such is the nature of the NFL. A guy is hot one season and the next he's Chris Johnson. Even if he was healthy, Mike Vick probably wouldn't be on here, considering the sample size of performance we have seen so far.
But more fun than focusing on the disappointments is sizing up the new forces of nature descending on the league, while contrasting them with the ones who have been the picture of consistency.