I saw Malik several times over the years as a Big 10 fan. I honestly can't get a read on him as I see mixed, but I blame some of that on Michigan State as they have completely lost their defensive identity since Pat Narduzzi, their former DC, left to become head coach at Pitt. MSU had a downhill close to the LOS type defense and they were simply very tough. I feel like their entire defense was not the same.
I think Malik has Aaron Donald type interior DT skills, but he lacks the consistent motor and maybe concentration.