I only watched Spain game today. And that mainly to see Delufeu play. I am very disappointed by his play today, and his overall play in the tournament has been erratic as well.
Spain were shite for the most part, but Mexico ran out of gas at some point. Mexico have to blame themselves really, when Spain were shite for large periods of game, they were still negative with 2 banks of four and counters. Counters weren't bad, but they should have scored 2nd.
Regarding Suso, he was better than most, but he also had a lot of unnecessary errors. Bad passes, taking too long on the ball to shoot, poor shooting, dribbling to nowhere. There are very few refined mature players in this tourney, and Suso is not one of them. But he brought some urgency to Spanish midfield.
For Spain, IMO, in this age group, a faster direct game would suit much better. Both Delufeu and Jese are runners, not the classical Silva and Cazorla type wingers. Passing tiki taka game doesn't seem to suit this Spanish team very well.