It's really hard to get a grasp on really what you have in the months after the draft. Many players haven't even hit full season leagues and some are only on the field to get experience with the results being secondary. Thanks to the signing deadline being moved up we now get a slightly longer look at some of the prospects.
I thought the Royals 2015 class was just okay. I wasn't impressed immediately and I'm not sure how I feel about it even in the small sample size of returns so far. It'll likely be 5-7 years before we know how it ends up looking.