Then there are players who come under the often-unfair and hastily-raised whip until A) they've had a chance to settle in and start playing better, B) the supporters start to better appreciate the things they bring, C) a combination of the two.
Kelvin and Kenwyne would be two of many, many examples over the years.
Some excellent players have been on the receiving end of this kind of criticism at various teams and various times.
But it also goes the other way. Much as I like the guy, I have no idea how Francis Benali became such a cult hero despite some absolutely hideous clangers.
As Ewell said "Do (managers) know more than us? I think so."