These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Ron the Death Eater: Ron and Dumbledore, to elaborate Ron in canon had no noteworthy accomplishments or feats to his name and in fact was the cause of most of the group's interpersonal problems. Without Harry as his friend he never grows out of this though its debatable whether he did in canon. Dumbledore has a Black or White view of the world, no shades of grey. You are either Light or Dark. Dumbledore in canon has manipulated anyone and everyone without divulging any useful information to his allies until no choice is left. Almost all the books plots are caused by his meddling or inability to do his job. Kieren has highlighted this though has also said that Dumbledore could just be senile.