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PRO: His slider cracks hard and it is -12 mph off his fastball, meaning that it "moves" about 2 feet toward the pitcher as the batter swings. His slider is a legit Nellie-style weapon.
CON: He leans back in the windup, never a good thing, his front foot does a contrived pretzel and his drive down the CL is ... not.
It's easy to see what the M's liked, with that scary RH breaking ball that Ruffin never seems to hang. I was surprised to see him so shaky as to his consistency.
Big upside, lot of work to do, is a Josh Lueke Second Chance. My $0.01.