Maguire is over-hyped because he is English and there's not much quality in England's CB position. If he wasn't English, the big clubs would likely not bothered with him at all. Whether Maguire can be great and be consistent at the highest level remains to be seen. If it is really 80-85 million, then Maguire will cost United even more than Van Dijk to Liverpool and De Ligt to Juventus. For that kind of money, United would have been better off signing De Ligt, who will at least give them 10-12 years of service. Also, United are really daft in this transfer. Mourinho wanted Maguire last summer and he reportedly cost 60-70 million back then but Ed Woodward did not back him. They even thought that asking price was too much! Now, they're gonna pay 80 million+ for him.
Time will tell but Solskjaer going for English players and "forcing" the club to pay big money for them is similar to when Kenny Dalglish did the same with Liverpool about 8-9 years ago. United may be getting better quality players overall but that Liverpool situation didn't turn out too well for them.