I personally think Mussina is a HoFer, and will get there eventually.
He ends his 18-year career with a 270-153 record, a 3.68 ERA and 2,813 strikeouts in 3,562 2/3 innings. It's a Hall of Fame-type record. He ranks tied for 33rd all-time in victories, and his ERA+ of 123 puts him in the same territory as Juan Marichal and Bob Feller. He ranks 66th all-time in innings, but 19th in strikeouts. Among pitchers with at least 2,000 innings, he has the eighth best K/BB ratio. Hurting his case is that Mussina never won a Cy Young or played for a World Series winner. His postseason record was 7-8 with an impressive 3.42 ERA in 21 starts and two relief appearances.