Here's my take:

5. Jack Lambert

4. Troy Polamalu

3. Joe Greene

2. The Bus

1. Hines Ward

There are certainly many others that could be placed on this list but the rationale for this specific fanpost is that many Steeler fans' #1 player would be Hines Ward. He is everything that embodies not only Steeler football but the general identity of the region's people: hard work, perseverance, toughness, and resiliency. It would certainly be a day of mourning when he isn't wearing Black n' Gold.