While true, it does not mean quality stuff does not get major league hitters to chase, and McDermott's two breaking balls are quality major league offerings.
I share the concerns about uncompetitive pitches, but McDermott does throw enough pitches in the zone and has the quality of the breaking balls to at least work in relief in my opinion. Now ill it work as a starter, I just don't know yet. I do think he could be an asset in the pen this year though. Maybe not in high leverage right now, but I'd put him in that two inning 5th or 6th inning role and see how he looks for a bit.