I went back and watched the bottom of the 1st through 3rd innings of Thursday's game to see what I was missing about Dietrich Enns.
First, he's definitely a soft-throwing control lefty, which we've seen several times in recent memory, starting with Scott Diamond, going to Andrew Albers, Tommy Milone and Hector Santiago. None of them lasted very long.
Second, he knows how to pitch. He was spotting a down-plane fastball low in the zone. Velocity was around 90 mph.
Third, his curve ball was a disaster waiting to happen. It had a big, fat hump in the middle, the kind of trajectory that would make Kirby Puckett pay a man to throw his curve ball. I believe Puckett called that kind of curve "a gift from God." If Enns doesn't shave that hump, throw it lower and control the depth better, he'll get killed.
Fourth, he does have a change up, which I saw him use to get a whiff on one guy. He should use it more often. He absolutely must use it, especially against righties, who are salivating as they sit on that hanging curve.
It is barely possible that Dietrich Enns could survive in the majors. He must spot his fastball with great accuracy low in the zone. He must throw his curve with less hang. He must throw his change up more often, especially against righties. If he could develop a fourth pitch, that would help, too. Maybe most important, he has to learn to pitch like Bartolo Colon, varying speeds, placements, mixing his pitches, and staying away from the middle. A soft-throwing lefty has to be a real artist, or he'll get slaughtered by all those right handed batters.