as an almost exclusive against-AI player, i too was worried about all the clamoring from online-players about toning down the so-called 'super back problem'.
on custom sliders equal or more difficult than all-pro, i didn't find stopping the run a problem. yes, i did get burned but there are always several big games by rb's in the pros every week. i found it realistic with regards to stats (if maybe not how the stats were generated...yes, broken tackles were too prevelant).
one of the pix that steve posted shows the leading rusher for the season. the pic shows that the longest run by that rb was in the high-30's i believe. that's not realistic.
now, before i get blasted, i know that there are sliders and, believe me, i'm guying to buy and play the heck out of this game regardless. just wanted to add my 2 cents and let all the 'yea, super-back is fixed' guys out there know that some of us liked the running game just like it was.