I just watched whatever videos are available online on Gettinger and unfortunately I'm not impressed despite most of them being highlights that should make him look better than than watching full games.
On the up side, he can see the ice very well when he has the puck and his shot is deceptively good with a quick release and excellent accuracy. However, his skating is bad. People think he's only a bit worse than other Junior players, but he's big, so it's good for a big guy. This is wrong. The average Juniors player will in their prime be lower-end ECHLer. Many will play in semi-pro leagues like the FHL and SPHL or will just not play hockey after 20. Being worse than them is not a good sign, regardless of size. When watching him, I imagine what would happen if he were surrounded by AHLers and he'd be humiliated.
Despite being the team captain, Gettinger is playing mostly on the second line. The first line has 2 absolute beasts and as a result SSM is the best team in the Juniors right now. They won their last 16 games, including just beating the second-best OHL team (and the third best Junior team). Timmay, therefore, gets easier opponents. At times he can skate around them with the puck, but if he ever tries to pull that in the AHL, he'll get undressed in milliseconds.
The biggest problem with him is that he just stands there watching the game when he doesn't have the puck. It's almost comical. Someone should charge him for a ticket because most of the time he's watching the game, not participating in it. This is true even when he's just behind the opponent on a breakaway. He just lets him skate in on the goalie instead of chasing and harassing.
Gettinger also does not use his size. Instead of driving to the net to screen the goal when he doesn't have the puck, he's chilling somewhere near the blue because, hey, watching hockey from 20 feet away is fun! Even when he does pretend to screen the goalie (usually on the PP), he doesn't stick his ass in the goalie's face and tries to annoy the goalie while blocking his view the way Kreider does. Instead, Timmay just kind of stands there. Unless Gettinger's tshirt stinks, the goalie is completely not bothered by him. I did not see one play where he used his size to his advantage. No big hits, no driving with the puck THROUGH the opponent, no manhandling an opponent when Timmay is defending 1-on-1, no garbage goals, no physical plays when fishing for pucks in corners against a plucky opponent.
The combination of poor skating, not using his size and awful away-from-the-puck play leads me to believe he'll be either an overager or more likely (because he's big) an ECHLer next year. His shot and vision will lead to him scoring decently well in the ECHL, but he'll be lost in the AHL if he's ever called up there.