de Gea has both a huge reputation and stats backing him up. if you look at xG f.e. (
https://understat.com/), United conceded 15.54 goals less then they should've in 2017/18, that's better than both Oblak and Alisson.
Besides, it's not like Oblak is given a poor rating in FIFA 19, he's on 90, that's hardly criminally underrated
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