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.
The author also takes a few potshots at the wizarding world in general (though the most grievous to Harry is lack of ramen) and especially the setup of the Twiwizard Tournament. Aka: If this is about inter-school unity, why are we competing against each other?
The Slytherins are made more tolerable through Harry's power of Icha-Icha. Draco even saved Harry once so he'd stop owing Harry his life for the Hippogriff incident.