Daisuke has always been up and down as a starter, though. He was certainly on a role before he got hurt, but let's not pretend he's something other than what he is: a pitcher who doesn't attack the strike zone enough, is inefficient, but has excellent stuff and works out of a lot of the jams he creates.
On the other board I post on one of the guys who is really into baseball statistics made the arguement that DiceK is actually more effective when he does not attack the strike zone. Seems that when he tries to do that he throws too many pitches down Main St, but when he is nibbling more at the corners he generally misses the heart of the plate. Sure, his pitch counts are high, and he walks more batters that way, but his ERA is actually lower when he nibbles. I cannot recall all the data or much more about how this was proven as it was a few years ago.