Surely it depends on the expectations of the club before the season begins.. a manager at Chelsea and Arsenal (for example) willbe judged completely differently than a manager at West Brom.
So it isn't all about results
So Pochettino is all that's wonderful because Spurs expect to be sh*t, and Wenger is useless because Arsenal expect to win the league?
I've heard some nonsense in my time, but this probably takes the chocolate Hob Nob.