Frankly, for a corner outfielder, especially for a guy in his prime, that's good not great, even with the Oakland factor. And we're talking about where he'll be in 5 years hen he's 35.
I would not have drafted Jack Cust.
Because when judging a kid under the age of 24 I, apparently unlike some, recognize that you need to look past the big league numbers a little. Butler is fundamentally sound and was drafted early in the first round for his hitting ability. He's shown monster power in the minors and is starting to hit in the big leagues. There's no reason I can think of that that power won't translate.