Wow.
Haren hasn't been great this year, but he has a long track record of success. He has been one of the best pitchers in the majors for several years, and he is only 29 years old. Furthermore, some of Haren's peripheral numbers suggest some tough luck this year, in particular his absurdly high .350 BABIP. There are good reasons to think that Haren will bounce back, even though he is still pretty valuable this year.
Also, Dan Haren is signed through 2012, with a team option for 2013. Bottom line, the Angels just acquired a heck of a sidekick for Jered Weaver. Their rotation is set for the next couple of years. This deal is a tremendous boost to the team right now, as well as in the future.
So, what did the Diamondbacks get for such a valuable asset?