For all the hype that Joey Porter gets and with James Farrier, Clark Haggans gets little talk for what he does. He's right near Joey Porters level and had 40 tackles and 9 sacks.
He isn't as fast as Porter (I think he makes up for it with his strength), but Haggans' presence on the feild definately cannot go unnoticed, the guy is a part of that great blitzing D that Pittsburgh has and is great putting pressure on the passer. Another guy who I like is Larry Foote, he will be their main guy in the middle once Farrior retires.
Yeah I agree, the focus on the Defense is always on Joey Porter and James Farrior but when we need another guy to step up, it usually Clark Haggans. Think he piled up 10.5+ sacks or something, not sure tho but he definately is underrated. He can get the job done.