If Stroman becomes like Halladay then we're laughing. They're similar with the GB ability, limiting walks, okay strikeout rate.
Strikeouts do matter. If Stroman can keep his GB% and BB% where it is and striking out 7 or 7.5 per nine he's a very good pitcher. If he's only striking out 5.5-6 per 9 then probably only okay.