Nyambe suffered from a similar thing,not saying you're doing the same, but if you call out the negatives but fail to point out the positives, you've automatically got yourself a poor player.
Miller suffers from being signed under the Gestede regime. To a lot of people, he's shite until he proves them wrong, and boy do they not want to be proved wrong.
I've read countless times on here, "I'll forgive them most things if they give it their all". That obviously doesn't apply to Miller, because there's nobody tries harder.
As I've said before, he's no Franco Baresi, but he leaves nothing out there, and I for one think he deserves a wee bit of slack.