Mid table.
Maguire is better than De Ligt.
Ugarte, who knows. I was told on here that Amrabat was the answer there last Summer.
That forward line is average at best, as we saw last season.
I understand your concerns, I have some myself, but this isn't mid-table.
Onana is a top 2 ball-playing keeper in the league behind Ederson. Every successful team plays with a technical keeper these days bar maybe PSG and Madrid, but that's also down to them not needing one for their respective domestic leagues.
Dalot has been one of the best right backs in the league.
If de Ligt is a 24 year old Maguire that we can get for 40-50m, that's great business. CBs of that level and pre-peak age come for 60-80m these days.
Martínez doesn't need me praising him, we all know how good he is. Same with Mainoo.
Shaw is arguably the best left back in world football, but needs to be managed carefully to avoid injuries.
Fernandes is a top 2 chance creation machine behind KDB in world football.
Hojlund is one of the biggest U21 striker prospects around.
Amad and Garnacho have both shown big promise and at the very least they are two solid PL wingers who can absolutely contribute massively for a top 6 team.
Ugarte definitely improves the current side, whether or not he's a player who can regularly start for a PL / CL contender.
Maybe mid-table has a different meaning for you?