Isn't he rated to be the better than Depay as well?
Not even close
So how good is he?
Well, to my mind Memphis Depay, who is 4 years younger, is already a better player and has the potential to become Van Persie/Robben level. Wijnaldum on the other hand is what I would classify as a fairly solid squad player at international level for Holland. For me, he probably wouldn't have been a starter in Brazil, and I think he was often the weak link when he played. Probably a similar level to Cabaye and Sissoko for me.
Is he more of a box to box player rather than an attacking mid? That's the impression I got from his YouTube videos.