Scroll down to the second table. ESPN uses PFF's stats to show the 2009 and 2008 leaders in Yards After Contact on a per carry basis. So you have something to compare Steve Jackson's 2.6 YAC to. Without comparison it's hard to say whether 2.6 is good, bad or whatever.
http://sports.espn.go.com/fantasy/football/ffl/story?page=nfldk2k10advancedstats
Just a btw, PFF ranked the Rams offensive line the 14th best at run blocking after the 2009 season and Jackson averaged 4.4 YPC that season.
It's a flawed statistic.
When does the "contact" take place? There is a big difference between a RB getting blown up in the backfield, or a RB not getting touched until a failed arm tackle by a DB 8 yards down the field on a 20 yard gain. However, the first RB is punished with 0 YAC, while the second RB is credited with 12 YAC.
Here is a typical game sequence from the Rams this season:
St. Louis Rams at 05:41
3-J.Reed kicks 66 yards from SF 30 to SL 4. 16-D.Amendola to SF 12 for 84 yards (59-T.Gibson).
1-10-SF 12 (5:28) 39-S.Jackson right guard to SF 10 for 2 yards (94-J.Smith).
2-8-SF 10 (4:48) 39-S.Jackson right tackle to SF 9 for 1 yard (98-P.Haralson).
3-7-SF 9 (4:03) (Shotgun) 39-S.Jackson left end to SF 10 for -1 yards (22-N.Clements, 99-M.Lawson).
Timeout #1 by SF at 03:54.
4-8-SF 10 (3:54) 3-Josh.Brown 28 yard field goal is GOOD, Center-45-C.Massey, Holder-5-D.Jones.
Rams up 22-17, Amendola with a big kickoff return, Rams can essentially end the game with a TD. Instead, Spagnuolo, in his usual ultra conservative fashion, brings in the TE's, calls for three consecutive predictable runs, in which the 49ers stack the box and blow up Jackson three consecutive times.
Spags settles for a FG. Everyone in the dome boo's Spags after the third run.
Notice on all three plays, 49er DL are in on the tackle. Jackson has three runs, for as total of zero YAC. Is this because he's a soft back who wilts when hit, or is easy to bring down? Of course not. He is known as a powerful runner who THRIVES on contact. But what can you do, behind a finesse pass blocking line, and being hit immeditately at or behind the line?
Here is the very next Rams possession, up 8 points, needing 2 first downs to seal the game:
St. Louis Rams at 02:19
1-10-STL 46 (2:19) 39-S.Jackson right tackle to SL 43 for -3 yards (94-J.Smith).
Timeout #2 by SF at 02:15.
2-13-STL 43 (2:15) 11-B.Gibson right end pushed ob at SF 43 for 14 yards (22-N.Clements).
1-10-SF 43 (2:07) 39-S.Jackson left end to SF 41 for 2 yards (99-M.Lawson).
Two-Minute Warning
2-8-SF 41 (1:59) 19-L.Robinson right end to SF 46 for -5 yards (30-R.Smith).
3-13-SF 46 (1:19) 39-S.Jackson up the middle to SF 43 for 3 yards (91-R.McDonald).
Timeout #3 by SF at 01:13.
4-10-SF 43 (1:13) 5-D.Jones punts 24 yards to SF 19, Center-45-C.Massey, fair catch by 19-T.Ginn.
Again, Spags brings in the jumbo package, calling 5 runs, 2 of which go for losses behind the soft Rams run blocking line. Jackson is again blown up by defensive lineman on his three runs.
Three carries, 0 YAC.
The Rams have trouble run blocking as it is (as evidence by Jackson's low YPC this season), but they are downright terrible when the opponent knows the run is coming. The Rams have had trouble closing out games all season due to this, and Spags has yet to adjust.
Yards after contact is a garbage stat with no context.
...And here is my favorite sequence of the season from Spags. This was AFTER the two minute warning of a 19-6 game. Ken Wisenhunt had stopped calling his timeouts, conceding defeat. Take three knees? Of course not. Bring in the jumbo package, and needlessley run Jackson into the teeth of a 10 man front for no apparent reason:
1-7-ARI 7 (2:00) 39-S.Jackson left end to ARZ 4 for 3 yards (27-M.Adams, 51-P.Lenon).
2-4-ARI 4 (1:17) 39-S.Jackson right end to ARZ 8 for -4 yards (53-C.Haggans).
3-8-ARI 8

34) 39-S.Jackson up the middle to ARZ 14 for -6 yards (78-A.Branch).
Gains of 3, -4, and -6, Jackson getting blown up AGAIN, thanks to a clueless Spags leaving both Jackson and his overmatched OL out to dry.
3 carries, -7 yards, 0 YAC.
I can post these types of sequences all day long. Spend 5 minutes on any Rams board, and you will see tons of threads on Spags curling up into a ball with any sort of lead, and leaving the running game out to dry.
The point, is ripping Jackson for a contrved stat like YAC, and crediting his OL with his production, is a clear indicator of a lazy writer who doesnt have a clue. If you want to tell me he doesnt belong in the Pro Bowl, i'll listen, but you will lose me the moment you give credit to his OL in the first sentence, and use a stat with no context.
It's easier to be lazy, and say "3.7 yards per carry? That sucks!". To me, Jackson is having his best season since 2006.