Maholm was acquired to stop the bleeding in a pennant race when almost the whole rotation had gone belly up. He had a history of dependably, boringly going six or seven innings at a time and giving up runs at a league-average rate. That was valuable at the time. It only cost a pitching prospect that I assumed Frank Wren knew enough about to give up on. I don't form strong opinions on players whom I haven't seen because I have to assume that the scouts and coaches who watch them every day know what they're doing.
This spring is completely different. The Braves are suddenly in scramble mode as far as the rotation is concerned. They have two guys under contract for 2015 and beyond who have ever done anything at the major league level. They have Alex Wood. They have Graham, who hasn't pitched over AA. They have Sims and somebody else way down in A. It's pretty thin for 2015. And they've got five or six starts this April they need to give to somebody who is not otherwise in this year's plan. Hale obviously isn't a great prospect but he's been a competent minor leaguer; I'd rather give him that month's worth of starts to see how he does than give them to somebody who's likely to be gone in a few weeks. Maybe he could useful as a 5th or spot starter next year until the guys in the low minors are ready. I don't know. I know that I have seen worse pitchers than him man down a spot reasonably well for awhile.
I realize that you already know everything about all these prospects, even the ones at the bottom of the organization whom you've never seen pitch, and you know exactly which ones are going to pan out, and so maybe you're not worried about the Braves filling out a rotation next year. Unfortunately I don't know the future so I am.