Some of this ranking has more to do with mere stats, etc.; some has to factor in intimidation, aggression, etc. It's one thing to make a tackle, it's another to do so with bad intentions. Some players just do their job and make the tackle, others try to inflict as hard of hits as possible, and like it. 1.) Jack Lambert. His ferocity is not overrated. He made John Elway consider becoming an accountant. The only player as impactful to creating the 70's D was Joe Green. #58 was as real as it gets. 2.) Greg Lloyd. What a wrecking machine. He seemed to be in every tackle. He was nearly on an LT level of play in his impact. Too bad he wasn't on a team that won a ring. He sure deserved it. 3.) James Harrison. Career was shortened due to being a late bloomer, but the man was a beast, especially before the new rules. He could knock suckers out on command. He was a wrecking ball. 4.) Jack Ham. A perfect technician. Good at everything, always took the right angles to the ball. 5.) Kevin Greene. Didn't play his entire career in Pgh, but his best years were here. Amazing Partner with Lloyd. Man, what I'd give to have a pair of OLBs like that right now. We'd be talking rings. 6.) James Farrior. Led the team in tackles almost every season he was here. And was clearly the team leader on D. 7.) Joey Porter. 8.) Mike Merriweather. 9.) Levon Kirkland. 10.) Jason Gildon.