Dice-k gets a lot of crap, and most of that is because of the ******** he pulls month after month and his complete inability to adjust to the mlb. But he's still not a complete bust, and to say he's had two bad years is stretching the truth.
His first year here, he was in an adjustment period, but he still pitched fairly well, and went 2-1 in the playoffs before the team's world series title. 200 innings, 200 strikeouts, 4.40 ERA, 15 wins. His ERA was 3.84 before the All-star break, and 5.19 after which showed that he probably got worn out by pitching every 5 days instead of 6 like in Japan. That was no disaster. And his second year, he came in 4th place for Cy Young.
The point is that yes, Dice-k isn't the best 100 million dollar investment this team has made, but he's not a sunk cost. He has 42 wins, and well, the only Red Sox player with more than that since 2007 is Beckett.