Muniain has been hyped for a while now, mainly because you can make him incredible in FM if you focus his training.
IMO, he needs another year before he's good enough to perform consistently for a top level club and we don't have the time to get him there. With Lukaku we had to go in before he was ready because he needed to be trained as a more complete striker; Anderlecht were just using him as a battering ram.
He would be a great purchase if we spend an absolute ton in the summer but I think a top quality striker, a right back and left winger/creative central midfielder have to be our priority.