As of this moment, no he is not. Does he have the potential? I 100% believe he has. If we keep faith in him and get 2 good strikers in, I am 100% sure both Sigurdsson and Klaasen would flourish. We are making the mistake of writing him off way too soon and not realising that you need time to adapt. Getting subbed on HT in every start hardly does good for your confidence.
The reason Klaasen was brought was to press from the front and then get involved in the attack. Clearly he is struggling in a new country and league. The same was the case for Eriksen in his 1st season. How he has adapted and flourished since.