I haven't been doing this a super long time, but a couple recent ones that aren't off to good starts are Quinnen Williams (who I thought was pretty much a lock to be a beast, though I'm definitely not out on him yet) and Stanley Morgan (who I think was like my #5 WR in the class last year and I believe was a practice squad guy all year. The latter seems pretty likely to be a mistake. We'll see with Quinnen.
In terms of being too low on guys, Calvin Ridley comes to mind.