He seemed really strong in his draft year(last year) but this year he was just shadow of him from last year. He couldn't handle expectations, in many games he was totally invisible or drew bad penalties and was unresponsible defensively. Yes he played sheltered minutes as 3-4th liner with no PP time,but still he showed more bad things than good. I think that it's because he lost his mentor Miroslav Satan,they used to play on same line last year and he couldnt handle all "fame" what he got from high draft position and good play in last year. So I think that he is overvalued and product of good teammates. So now to tell something about his pros: He has grit and is strong on forecheck and if he's in okay mood he can show some good finishing.
To sum it up, he has to work on his mindset and need few seasons in AHL to reach his potential, but im not optimistic,that he would be top 6 forward, I see him as 3rd line wing at best. Let's hope,that I'm not right and he will become good player
EDIT: I know him a bit personally and wish him all the best, but I don't think his play will be good enough to fill top 6 role in NHL. If u saw WJC this year, he was at best 3rd best forward on team Slovakia, what is really weak, Reway and Cehlarik was better than him and these guys aren't projected as top 6 forwards. Just don't have so high expectations on him.