Here are the highlights from week 2:
http://www.nfl.com/videos/kansas-city-chie...nson-highlights
Outside of week 2, he has nothing of note. Even in those highlights, he looks slow and not elusive at all. The Raiders make everyone look at least competant.
He's being outclassed by Jamaal Charles in pretty much every way:
vs PHI:
Johnson: 19 carries, 38 yards, 2 ypc
Charles: 6 carries, 36 yards, 6 ypc
vs BAL:
Johnson: 11 carries, 20 yards, 1.8 ypc
Charles: 4 carries, 16 yards, 4 ypc
Charles is a better receiver, too. He has 4 recs in both games he's played. Charles didn't play in the OAK game.
Part of the reason is that KC's O-line is terrible. Charles is the kind of player that can thrive on elusiveness when the blocking is poor and is a good receiver, whereas Johnson is basically a product of the holes that open up directly in front of him.
Edit: Don't forget that KC's defense is terrible, so they're going not going to be running out the clock on a lot of leads this year.