Nobody's saying he isn't a good prospect. Everyone's talking about who to take with the Habs first pick and why. We'd all love to have him in our system but we question taking him where the Habs will pick (likely top 8) simply because we see better options.
You can believe what you want to believe regarding his physical engagement level but there is a lot of discussion right now by draft pundits regarding Catton's will to pay the price in the playoffs.
As for success at the Hlinka tournament, Cam Allen was arguably Canada's best player the previous year and went into the season in the top 10 of many early draft lists. He ended up going in the 5th round and has 9 points this year in the OHL. Not at all the same situation as Catton, but I'm just saying there is always a lot of evolving throughout the draft cycle. Most put a lot of stock in league playoffs.