There's little doubting Bironas had a very good year in 2010. He made all of his extra points (for the fifth consecutive season) and a career high 92% of his field goals (24-26). He had a particularly good year from distance, making 10 of his 11 attempts from 40 yards and beyond. In our special teams numbers at Football Outsiders, which take into account distance, weather, and stadium, the Titans ranked second in FG/XP points, narrowly behind the Texans.
Chances are good, though, Bironas won't be quite as valuable a kicker in 2011. Simply put, kickers tend to be inconsistent from year to year. If Bironas attempts the same mix of field goals again, and makes them at his career-average rate, he'd make two fewer field goals than he did last year. If he's as "unlucky" in straight percentage terms as he was "lucky" in 2010, he'd make four fewer field goals than he did in 2010. That alone would probably be enough to push him from among the league's best to average or below, all without changing Bironas's essential quality as a kicker.