They will try to play the Rams the way the 49ers do: play hard, tight, aggressive defense, sledgehammer-run the football, and exploit the Rams soft zone coverage by throwing 4-5 yard passes to Allen Robinson and having him get an additional 2 yards every time.
Collectively, I think the Steelers are the dumbest team in the NFL with the exception of the Ravens. We'll probably see some cheap-shots or borderline hits by the Steelers on Rams players. Hopefully they get flagged for them.
The best scenario for the Rams would be to get ahead early but this will involve tremendous risk as the Steelers will stop at nothing to keep it from happening; they want nothing more than for the total points scored going into the 4th quarter to be less than 20; Tomlin knows that they are dead in the water under any other circumstance.
Whoever starts at cornerback opposite of Weatherspoon will be targeted a lot, so this is not a week for boneheaded errors or stupid behavior and penalties.
Rams should win going away with a +2 turnover margin.