I guess you are speaking of Dach, Barron and Newhook when you say "players acquired". To be fair, it is not KH fault if Dach got injured and lost a full year when in fact he was trending upwards.
Newhook is playing exactly as advertised. I think some have a romantic notion of what he can bring to this team. In an ideal world, he should play 3rd line/energy style where he can use his speed to forecheck. He's in the wrong chair because of the lack of depth on this team.
I never like Barron and that trade so, that is indeed a clear "fail" for KH in my book, but no GM wins all it's trade.