If you're talking about health, he's been quite durable, actually, an inning-eating horse.
My criticism about Nola--and some here have bristled when I said it--is that I've always thought that Nola is kind of soft. Whenever he starts a game that the Phillies desperately need to win, he often comes up short. Career in the Postseason, his numbers decline in the NLCS and WS when the lights are brighter. And, all of this is anecdotal but I have always gotten the sense that he does not proverbially "take a punch" all that well--the opposition shows a hint of starting a rally and he crumbles or he gives up a home run with the Phillies leading by two or three runs and let's that home run metastasize into a full-blown lead-blowing rally instead of bearing down and putting it behind him.