Not a Q watcher, but Pronman described him as "the best player on the best team in the Q" a couple of months ago. He was a bit surprised he didn't get an U20 invite.
@Gumbercules is probably our man though.
Most Q watchers were surprised that Poulin was left off the WJHC invite list. His injury occurred immediately before the invites were announced, so maybe Hockey Canada just was in the know on the extent of the injury and knew he would not be available. Mikael Lalancette is probably the most knowledgeable writer that covers the Q, and Poulin was the most notable omission from the team in his view.
As for Poulin's game, there aren't a lot of holes in it. I don't think it's a certainty that he has top line scoring ability however, and I would be surprised if he made the Pens out of camp next year. He benefits a lot because of how physically mature he is, but jumping into the NHL, that advantage won't be there for him right away.
I personally don't get too excited about any players putting up points in junior, unless they are at insane levels (IE: Lafreniere numbers). Guys get drafted because they are good junior players, big numbers is the expectation, and Poulin is just meeting expectations in that regard for me. He also plays on a line with two very good overagers (Voyer & Robert). I will offer one nugget regarding the stats that does impress me however: of his 27 goals, only 4 have been on the PP, so he's not just racking up points during the premium ice time.
I still quite like him as a pick and prospect however. He really does offer a bit of everything. Can put him in a defensive role, on the PK, on the wall on the PP, or in front of the net on the PP. Can play a chip and chase game, but also a north/south rush game, and he is very good along the wall, doesn't pass up opportunities to get the puck on net (shots per game is among the best in the league). His skating isn't electric, but it's not a problem area either. I suspect he really is a coaches dream, so who knows, maybe Sully does take a shine to him next year. If I was going to put an NHL comparable to him, it would be Mark Stone (stylistically at least, expecting him to be that good would be optimistic). Even Stone spent four years in junior and a full year in the AHL. The leap from junior to the NHL is huge.