I played 8 games with wijnaldum so far, all in divison rivals. He is a beast! He is everywhere on the pitch due to his H/H workrates. This is very good because I play with Moussa Dembele on RCM and Wijnaldum at RCM. Dembele compensates the defending when Wijnaldum isn't back in time. You could likely use fabinho here or maybe fernandinho. Use engine or maestro on Wijnaldum. This makes him even better. I really enjoy playing with him, he's only 30K so that isn't a problem for the most players, also it is a really good value for money.
Pace: He is everywhere on the pitch at all times. His stamina is 87 which would be pretty good but in my formation and with my custom tactis he's totally tired in the 70th minute or so.
Shooting: Altough I didn't score with him so far his shooting is very good, he hit the bar a few times with finesse shots.
Passing: His passing is very good, you can easily kick the ball to lucas at the other side of the field. Also his short passing is always on target.
Dribbling: Due to this length (175cm/5'9) and his 85 overall dribbling he is very hard to take the ball away from, his dribbling is very good and altough his agility isn't the best at first sight it actually feels very nice.
Defending: Wijnaldum can make a tackle and immediately run away with the bal, which makes him perfect for teams who counter attack fast.
Physicality: His physical isn't ideal, he's not the strongest player but he also can't be pressed away that easily. I talked about his stamina already which is a bit disappointing but if you use him with different tactics i'm sure you will notice his 87 stamina.
Heading: His jumping is 82 but he is only 175cm/5'9 which makes it difficult to actually head the ball. He'll always score if he's not being defended but if he is it doesn't happen too much.