I think they stick to their game plan, I just wonder, like the other poster, if that game plan is close enough to their real life game plan.
Also, I think the AI give up too easily on the run. I had a 1st quarter a while back (back when LJ was still on KC) where I stuffed Larry Johnson for under 2 ypc. Second quarter, they threw it more. Okay, fine, I've thrown it to get the AI off the run so I figured they were doing it to me.
Except they never went back to the run, even after I started harassing the QB and slowing their passing game. Larry Johnson had 6...SIX carries all game and was not injured.
Maybe I just tend to defend the deep pass, but the AI throws to the flats a LOT, even with guys like Moss or Fitzgerald as their WR. I don't control DBs or switch players so it's all AI vs AI in those interactions.