Not to give too much of a cop-out answer, I am and I'm not surprised. As
@StevenToddIves has written, there's a ton to like about McCarthy's game - he blends speed with physicality, has an excellent breakout pass, and looks to have promising tools to be a two-way defenseman. There's also a significant amount of improvement he'll need to make...most notably in his decision-making without the puck on his stick, his backwards skating, and top-end skating speed. The tools are all there but the decision-making can scare scouts a bit. If he gets picked in the 4th or later rounds, it'll be one heck of a value pick. HockeyProspect.com's Black Book had him Not Ranked and FutureConsiderations had him rated at 111, so he's probably just outside Bob's top-93.