The problem with betting a game like this, is that if Pittsburgh gets up early - TB is going to fold like a house of cards. They've already shown they have zero mental toughness or team pride getting blasted on prime time.
Lets say the Steelers kick a field goal and then run a kick return back for a TD = they're up 10-0 in the first quarter - this game gets out of hand by half time.
I wouldn't touch it unless it gets to 9, then its worth a small play as a back-door cover threat.
The under looks nice on paper, but keep in mind that Todd Haley's ass is on the hot seat and he isn't afraid to score points when they're there for the taking. He doesn't want to finish this season any lower in offensive statistics than he has to. Pitt's next game is against the lowly Jaguars - so no makings of a "trap" or need to save your strength there.
What I'm saying is = I wouldn't just bank on the Steeler's just being content running the ball and grinding out an ugly win. I think they win easily even though the score doesn't necessarily reflect how dominant it was. Something like 27-13.
Just my 2 cents though. Too early in the season to fall in love with these ugly dog spots.