Definitely way too early to write him off, but you can still be upset when you look at their players taken after him and the progress they've made. Guys like Othmann, Bolduc and Johnson are having exceptional years in the CHL.
Aside from hindsight being 20-20, Wyatt Johnson (an amazing pick by Dallas) was a reach at the time because he was a consensus second rounder. So there are a lot of teams that now wish they took him or traded up for him. The guys who were widely ranked in the middle of the first were Othmann, Bolduc, Lucius and Svechkov.
I actually like that BUF swung for the fences with Rosen. Maybe they well knew, because of his body type, that he was a 3-4 or even 5 years away guy, but hoped that when he eventually arrived, that he would be a true game breaker/play driver, and those guys are the hardest guys to find.
You never want to miss in the first round of course, but given the overall depth BUF has at so many positions, I'm glad they tried to hit a home run with Rosen and hope they do that with at least some of their top 4 picks in this year's draft and next year's draft.
It's far too early to decipher anything yet, so let's hope Rosen develops into exactly the kind of player they thought he'd be, because he's got the exact type of game that would be a great complement to what is already in the fold.