His GB% is the highest it's been as an Oriole. His HR% is below last year, as is his XBH%. His OPS is .615 vs a Career .605. Even though his BB% is at a career high 11.4% it isn't that much off the 9.9% from last year. He has converted 15 of the 17 save opportunities, or 88%, which is fine for a non closer reliever. Brooks baseball shows no real dip in velocity. The largest change is his LOB% is at a terrible 65.8% versus a career 82%. Fangraphs likes this years O'Day (0.4 fWAR) much better than last year (0.1fWAR) and about the same as the 2014-2015 version (0.7 & 0.9 fWAR for a full season).
To me, this suggests that when he struggles with his command, he's getting pounded but those times are fewer than what his ERA would suggest.