Yeah. One key thing to remember is: he was pretty bad last year, and in 2011. Even just rebounding to 2010/2012 numbers for him will be a big achievement, and that's ~100 ERA+ territory, a 3/4 starter on a good team.
Projecting him to surpass those numbers and become a top of the rotation guy is pretty wild, at this point. Those guys usually don't sign FA deals for 3/24.
His career ERA on the road plus the old yankee stadium is 4.24. I would argue a 27 year old with a career 4.24 ERA typically gets more than 3/24. Plus, he has the former top prospect label.
His 3/24 deal looks pretty similar to what a 30 year old with a 4.54 ERA would get (his career ERA). So when you factor in we get age, a better park, and a 4.24 ERA guy I think this is going to be good get for us.