Middle-six offensive winger that could be plugged into any line as both the digger and finisher.
He's a different flavour of the type of player Dubas has clearly favoured on the wings since he's had personnel control: plug and play players because they are fast/agile, smart as a base, and some standout strength to build off of.
Because of his skating, playstyle, and pitbull mentality regarding puck retrieval, he's an NHLer at minimum. He trains with Gary Roberts if you're wondering whether this tiny person can eventually put on the muscle to play this way. His shooting ability can push him top 6 depending on team's depth on LW at the time.
If you're looking at his draft year numbers and wondering why it's a bit underwhelming: Peterborough was garbage as a team and Robertson started the year injured (wrist) and mostly played the season in spite of it (for the draft).