I would go a little further (and apologies for being rather blunt): but I find the over-use of irrelevant images to be rather insulting, as if I am unable to maintain focus on an article, without the frequent shiny object.

I wouldn't necessarily call that further. The images I like are relevant because they visually explain things that are helpful. The images I don't like are irrelevant because they serve no purpose other than to Be Images for no good reason.