Better than Irvin.
Better than Irvin now?
You can look at McDermott's K rate, and hits per ip at Norfolk and obviously see there is legitimate arm talent.
But (and obviously era isn't the end all be all), his era in 19 AAA starts this year is 3.96.
Irvin's ML era this year is 4.62.
Povich had a 3.39 AAA era in 12 starts year... he's at 6.27 so far in 7 ML starts.
Irvin has been rough since the calendar turned to June, so maybe it's a wash.
Certainly know McDermott has better stuff.
But my guess is it's doubtful that McDermott is even as good as Irvin right now.