Mussina is still definitely worth drafting. I'm thinking about the 15th round would be about right.
His K / 9 ratio hasn't fallen, the problem is more a mental thing than anything else. He can go from ace to awful in a matter of minutes.
Draft him as your 4th starter confident of plenty of Wins and decent K's but hold your breath he keeps his ERA and Whip around acceptable levels.
I would still draft him over guys like Blanton and Garcia.
When you're right no one remembers, when you're wrong no one forgets - NZF