So asks Pro Football Focus:

Saquon Barkley is a generational running back: False
When the hype train gets moving, it’s difficult to temper expectations for players we really like. While Barkley is our top running back in the draft class, he’s not a perfect prospect across the board, and his work as a pure rusher is not as clean as other backs from previous classes or even in this class.

Barkley’s receiving skills separate him from the pack as he’s a potential mismatch weapon, both out of the backfield and when lined up wide, but as a runner, he does not maximize the yardage givenby his run-blocking.

He’s often too quick to look for the home run when a three or four-yard gain is there to be had, and this may lead to a bit too much dependence on his offensive line at the next level.

Make no mistake, when plays are blocked well, Barkley is an explosive, big-play threat, but his inconsistency may lead to a boom-or-bust style as a runner:

https://www.profootballfocus.com/news/draft-2018-nfl-draft-narrative-busters