Anthony Smith needs to learn to shut his mouth. When Steeler players open their mouths, the Steelers generally struggle. See: Joey Porter.
Smith has talent, but he is way too young and immature. He needs to sit behind Ryan Clark (When Clark returns from injury).
Polamalu being injured didn't help the Steelers.
Entering the red zone 4 times and not scoring a touchdown each time didn't help the Steelers either (Remember, their only touchdown was a 32 yard pass to Davenport).
I mean, Big Ben and Willie Parker didn't play terribly. They drove down the field. They ate clock. They just weren't able to score in the red zone. You can't do that in the NFL.
Two big plays, and boom, the Steelers lose.