LB - Greg Lloyd - Sure many of us loved him and know how good he was, but I don't think he gets enough love for how great he was. We all hear about how great Ham and Lambert were (and they were darn good) but in my opinion, Lloyd was even better than those guys but no one mentions him among Steeler greats.
OT - John Jackson - Stud LT that no one seems to remember. He was really good.
OT - Justin Strzelczyk - Seemingly lost his mind in how he killed himself, but this guy was a stud O lineman.
RB - Frankie Pollard. He played on some of the worst Steeler teams since 1970's but he was much better than given credit for.
WR - Yancey Thigpen. In his prime, when he was healthy (which was about every other year) he was a top 5 WR in the league. Most don't recall just how good this guy was. He ended up getting a boat load of $ from TN and never did anything since.
Eric Green - He was kind of an immature @ss when playing for the Steelers (rumored to have had big party the night before the AFCC game, which Pgh was upset by SD), but he was immensely talented. He would have been even better if he dropped 20 lbs.
CB - Dwayne Woodruff. He wasn't as good as Mel Blount or Rod Woodson, but that's about it; he was as good or better than every other CB we have had. At almost 6' and 200 lbs, he was big and fast. Very good player.
LB - Chad Brown. We forget how good he was, because he took the $ and went to Seattle, where he didn't do much. But he was wicked good in Pgh.
DE - Orpheus Roye - Much underrated DE who left for the Browns. But this guy was solid and good.
S/CB - Carnell Lake - Yes, most would say he is a good player, but he was beyond good; he was great. How many safeties can fill in for a CB and do a great job like Lake did? When his teams were in their prime, he, Woodson or Lloyd could make game-changing/winning plays when they needed it. He was phenomenal.
FS - Ryan Clark - Yes, his play slipped last year and his style became inept under new rules and interpretation of refs, but before that, he was playing at a very high level. I am glad he is not coming back now, but a few years ago, he was playing lights out football.