I hate the Steelers too, but I hate the fumble/tuck/forward pass call more, being a Raiders fan, so I know those situations inside out.
The thing about this, is that he did not lose control of the ball when he got hit. He was still holding onto it for a short moment extra, and snapped his wrist forward to throw the ball. I can see both sides of the argument, but being completely unbiased, I think it was an incomplete pass. However, I do not think it would have been overturned because it was so close, and you need conclusive evidence to overturn it, which is what I was most upset about in the Raiders / Patriots game. It was so close, that I don't think there was conclusive evidence to overturn it. It clearly appeared he had both hands on the ball though. If they had called it an incomplete pass from the get-go, I wouldn't have been so upset, because I can see how it could have been called an incomplete, but the fact that they overturned such a close call was what was ridiculous.