Honestly I don't get the total boner most people have for the sound of the 80's albums? For the most part they sound thin and fucking OLD to me. Killers has a pretty good mix, but every other 80's album I listen to in spite of the production, not because of it.
Brave New World sounds very good to me. Big, loud, heavy, modern, in your face. The drums in particular are HUGE. There's actually some low end weight to it.
It is slightly muddy (could be fixed with a better mastering job) but easily the best sounding Maiden record by a long way imo.
The rest of the reunion era stuff hasn't sounded great, but that's really down to Steve imo.