Weakly seconds perverse_idyll!
S/he pretty much said everything. Your Filch's voice and POV were fantaxtic; you gave him a background that made sense of his fanboying manacles and whips without excusing or prettying it up.
I would have thought that hatred or pity were the only possible reactions to Filch as portrayed in canon, but your Argus is entirely canon-compliant and defies either reaction.
Thank you for making him into a real person, and one whose voice I enjoy listening to.