He is mate
You don't captain Ajax to a Europa League final without having something about you
His problem, like Sandro, like pretty much everyone in fact, is a chronic lack of confidence
Klaassen and Sandro should never have been thrown in so early. It was moronic from Koeman. They both needed time to settle - neither of them got it and now they're devoid of playing time and confidence
Although I do have growing doubts whether Klassen will be successful in the PL (be that based on ability or adaptability), I do agree in parts.
Koeman has shown a frustrating tendency to shoehorn players into roles or styles that do not suit them, and our current perils can't help this.
Personally, Klassen has shown glimpses of clever movement and balls but unfortunately our approach means there's little options in front of him.
The pace of the Premier League added to our chronic lack of pace has left him floundering, which ultimately will add to his lack of confidence.
Is he good enough? I'm not truly sure, however with proves PL players like Sigurðsson struggling to find form then you have to provide leeway.
Likewise, Sandro is not an overly physical player who likes running onto balls played to his feet, whereas we simply lumped it up to him.