"The biggest-name free agent for the Titans — quarterback Matt Hasselbeck — made a big impact in 2011.

The biggest free agent — 6-foot-2, 325-pound defensive tackle Shaun Smith — did not.

And he knows it.

"I didn't feel like I played to the ability that I should have. I didn't play at a high level," said Smith, who signed a three-year, $7.25 million contract on July 29. "When you evaluate, you have to evaluate everything, including yourself. When I look in the mirror and evaluate myself, I didn't have the success I wanted to have."

Smith vowed to dedicate himself to improving and becoming more aggressive this offseason. That could go a long way in helping the Titans improve a run defense that backslid in 2011.

One reason for Smith's lackluster play: he was too big. He admitted he let his weight get out of control. The Titans credited the eighth-year pro with only 44 tackles and one sack.

Defensive coordinator Jerry Gray said Smith also had a difficult time adjusting to the 4-3 scheme after playing mostly in the 3-4 during stints with the Saints, Bengals, Browns and Chiefs."