Jacob deGrom may have had the stronger debut, but between the Mets' recent additions to the starting rotation, Rafael Montero is still the one to own.
As hard as he throws, he has a chance of making an impact as long as he finds the strike zone, but the scouting reports have made him out to be more of a mid-level prospect. Baseball America described him as a potential No. 4 starter coming into the season -- and that's in the real-life sense, not the Fantasy sense.
His minor-league track record suggests the same. While his debut made him out to be a bat-misser, recording six strikeouts while allowing just four hits in seven innings, he averaged 7.4 strikeouts and 9.3 hits per nine innings over his minor-league career. If he's that same kind of pitcher in the majors, he's probably on the waiver wire in most leagues.
Of course, Dallas Keuchel is the perfect example of a pitcher who overcame (or at least appears to have overcome) suspect minor-league rates to become a real Fantasy contributor, but after only one start, I'm not ready to classify deGrom as another exception to the rule.