As I think Nayim has alluded to, I think the thing with Aurier is that his moments of poor play are so egregiously bad. So not only do they outweigh all of his good moments in lots of people's minds, those good moments actually make his egregiously bad moments even more infuriating - because he so clearly seems capable of better. Coupled with the fact that many of his bad moments seem to relate to concentration/effort, which seems like it should be more in his control to correct or improve than a lack of physical or technical ability, I think he's even more maddening.
Does that mean some people underrate his overall performances, because the bad moments get overweighted and the good moments get underweighted? Maybe, I'm genuinely not sure. But either way I'd argue he is at least the second priority to upgrade on, alongside DM. Do you think he's any lower priority than that?
(Also I think some of your stats aren't totally valid, in terms of the criticisms people are making of him - e.g. it's not that he constantly makes loads of fouls, it's that he has occasionally made very stupid and costly ones. And for me the even bigger mistakes are ones where he doesn't track his runner at all, which just doesn't show up on stats).