Dolis has an 'interesting' collection of numbers in his work so far this season (excludes Sunday) per Fangraphs:
10.55 K/9; 5.09 BB/9, 84.4 Ave EV, .176 BA against, 1.17 WHIP
1.69 ERA, 3.29 FIP, 4.23 xFIP
1.69 ERA looks good, but yeah that 4.23 xFIP tells the story of why you responded as you did. I guess all the walks are the biggest issue. Even still a 1.17 WHIP is pretty good.
Bottom line: the guy is only making $1M (prorated) this year and the Jays have an option for a 2nd year at $1 M. Seems like a no-brainer to keep him around at that price.