As thin as our depth seems to be (I mean, come on, we called up a guy from A+ this past weekend), I'd say the Tigers could use all the help they can get. If he turns out to be terrible or if Delmon or Raburn really turn things around, release him.
I don't think it'll happen as DD seems to be standoff-ish on these types of low-risk veteran player signings, but given our current situation it seems silly not to give it a try. We passed on Abreu, and he's doing really well with the Dodgers so far.