He has the best K-BB% of the Brewers rotation. His issue has largely come down to too many mistake pitches over the plate getting hit out of the park. His xERA after yesterday is 3.89 which is 60th percentile so not bad, but the 29th percentile Barrel Rate is likely where you find the issue and sure enough his 1.49 HR/9 is 47th among the 59 qualified pitchers. If he can limit the HR ball, he will start to pitch much better.