For what its worth his 1.45 WHIP in the 9 starts where he wasn't shelled would put him 78th in the majors. Equivalent to an average #3 starter. The 1.63 WHIP would make him equivalent to an average #4 starter.
So even with those numbers he seems worthwhile as a #5 starter. Plus the fact that he does a better job than most pitching out of trouble and has a history of pitching much more effectively than he is right now and you have a player that isn't going anywhere unless he is hurt or completely implodes.