I think he can be decent. Don't expect him to sustain this success as a starter however. His career WAR is still -0.2, so he really hasn't displayed success over an extended period of time at the MLB level, and was hardly used as a starter in the minors. I think he can go on and have a similar season like Chad Gaudin did in 2007 (1.9 WAR) over a full season. Definitely possible if he's able to hold up for 200 innings.
I just don't see how people all of a sudden have projected him to be such a great starter when he doesn't have a long history of being a starter in both the majors and the minors. Also, it's not like he's been lights out in the minors anyways and he's already 30-years-old. It's a nice story to see no doubt, though there is no way anybody saw this start coming and it's pretty unlikely this continues.