If Jackson wasn't a stalwart, I don't think as many people would be defending him.
Sentimentality aside, what does Jackson do well on the football field these days? He can't pass. He has poor footwork. He doesn't have a fend or offload. He doesn't make metres. He makes no impact. His defence isn't what it used to be. He has no creativity...
Again, I know it sounds harsh to some because he's been at the club so long but if we were objectively looking at him as a player and he played for another club, no one would rate him and we'd laugh at that club for giving him three more years at 600-700k.