Thing is, I watched like 3 highlight performances on youtube, his goals and assists from the previous season and I knew he was crap. A couple of things stood out
1) 95% of his goals and assists were him cutting in and having a shot / making a cross, often against poor goal keeping / defending
2) He almost never took on a man, because he doesn't have the acceleration to beat players. His main abilities are good close control, good shot/cross, and fast when running.
Given all that, you really have to question the scouting that took place that saw us spend £80m on this guy. I know he's Ten Haag's picks, but as good a coach he may be, our old school methadology of allowing the manager to scout players just like with Mourinho and Ole is still actively hindering us. We need to move on and let the scouting team pick players.
Liverpool are a good example - Mane and I believe Robertson had great games against them and so Klopp wanted to sign them both. But it's now started to backfire - Darwin had a great game against them and then they signed him for £80m, but it was an outlier, not his actual level. We need to do more research on our signings.