In just under two and a half years as Villa manager in the PL, he had a points per game average of 1.18 which works out as 45 points per season.
That wasn't good enough for Villa and it isn't good enough for us (usually).
Obviously, his record at Norwich was much worse 0.63 points per game.
Overall, 120 PL points from 114 games doesn't suggest that he's who we should be looking to commit to long term.
He seems like a nice guy and his record in the transfer market is decent but you only give him the job going forward if expectations have massively reduced.