He's 0-2 this year, with a 7.84 ERA in 31 innings, and a 2.00 WHIP. He's been very unlucky this year (BAPIP .399; average is .303) and a 59% strand rate (average is 70%); his FIP is 4.88. He doesn't strike out many hitters (5.0 K/9) and walks 3.5/9.
His last year that he was good was 2007, and we will never forget how well he pitched against the Mets in 2006 in the NLCS for the Cardinals.
If the Brewers are going to pay his whole salary, I would take a chance on him. If he doesn't perform then you cut him and don't lose anything.