The VG Resource

The unexplained death of Remus Lupin(my favorite character) and the abscence of the creatures who fought in the final battle

Lupin's death isn't unexplained, it just adds to Harry's umm regret? that so many people had to die. Like the little Creevey bro. And Greg/Forge. I forgot which one died.
Also, what creatures?

let me in wasnt even that scary, it was really more about a 12 year olds love story - the most scary thing was the little boy with a telescope watching people have passionate sex

insidious wasn't that bad either, the most scary thing was the generic horror film elements (ie: jump/scream/etc)

Let's give one them a device that lets them travel through time! Oh, she can study more! What about saving the lives of several characters, or just going back and killing Voldermort when he's a little shit?

Remember that one dude nobody likes? Nevile? Let's turn him into a superhero. And let's only cast spells when we feel like it - fucking floating, let's just jump into a river.

Also, they just make everyone look older by not putting as much make up on and having them not shave for a week, plus a bit of podge, and a mullet on Harry.