He's a beast but he had some terrible drops. Wide open drops that just went through his hands. Don't make excuses. He was the worst offender in the NFL last year, statistically when it comes to drops. I can't blame him, he was known to have butterfingers in college as well. His stats are also full of garbage time so it's not a complete picture. He could have had easily 1200-1300 yards last season if it wasn't for his drops. I think he's going to be fine and a great piece for the future, but he's not a #1 right now but he could be with some more work.
Steve Smith and Demaryius Thomas dropped as many passes than Kelvin Benjamin did.
Smitty, Bowe, Colston, and many other players also had higher drop %'s
KB dropped some bad ones, don't get me wrong, but let's not act like it's the norm for rookies to be cheap, high quality #1 WRs