As someone who "saw him good" (his son was Cogliano's linemate at junior), Bob McKenzie has a pretty high opinion on Cogliano.
As always, entitled to your opinion because that's what makes the world go round, but I watched him play about 60 plus games this year and let me assure you it is my opinion that there isn't a scared bone in his body (very, very competitive when it matters most) and he regularly pays the price to score goals or to set them up. As with all offensive players, his defensive game needs some work, but I would not say it's a really weak part of his game at all. IMO, the only knock he's going to get is his size, but a lot of scouts I've talked to about him aren't all that concerned for two reasons. One, world class speed. Two, very, very strong, both in terms of strength on his skates and strength (core stability) in fending off hits and playing in traffic. Lots to learn, but he's a great kid from a great family and the upside on this kid is tremendous. If there's a draft, I'll be shocked if he's not a solid first rounder in spite of his height. Dynamic speed, good goal-scoring ability, great playmaking ability, fearless, competitive and a character player, IMHO.