Okay. I know this review is quite early, and I have only played 10 games with this card. But I would rather give a generalized, slightly inaccurate opinion on this card, so you can decide on whether to complete it before the objective expires.
So take this review with a pinch of salt.
For reference I play him on 9 chem with an engine on him, and the squad attached is how I set up in game. I played all 10 games in Division Rivals., where I'm in Div 6.
Anyway, with the disclaimers and housekeeping out the way, this is my review of FUT Birthday Klaas-Jan Huntelaar.
He doesn't miss. And with 98 finishing as a base card stat: you'd hope not. Shooting is arguably this card's most important feature, other than the 5* Weak Foot. And speak of the weak foot; well, in short: he doesn't have one. I purposely made him take shots on it, and you can't tell the difference. 93 volleys aint bad either, but there is a small hole in this card: long shots. They aren't bad per se, but they are often saved by your average Alisson or Nick Pope. I have Player Moments Memphis Depay who handles the long shots, so I only tried a couple with Huntelaar. Overall, if you give Huntelaar the ball anywhere in the penalty area: well, just skip the celebration.
Okay, Klass aint no Neymar, but it gets the job done. The 3* skills obviously isn't ideal, but its not bad. He does feel slightly heavy on the ball. but provided you partner him with a more agile player (Rashford, Neymar, Mbappe, Ronaldo, Depay) it not that big of a deal. Nothing special in the dribbling department, but as I said: it gets the job done.
He's a bully. Even up against Varane, Gomez, Van Dijk: with ease. Many a time he's sent Klaiber, TAA or Ferland Mendy to the floor with a shrug of his shoulders. I'd say, without his strength. he'd be considered average and I'd only do him for the fodder. But as it stands, I think his strength and overall his physical stats are the second best, after his shooting of course.
You know what they say: Every silver lining has a cloud. He's just not fast enough. Well, to be fair, he's certainly not slow; but he will easily be outpaced by Varane, Gomez etc. However, if you don't force him onto the ends of through balls, and instead play him as a target man, pace shouldn't be an issue.