the one thing good thing i believe Snape did was to save Draco from Voldemort. Voldemort would've killed Draco if he knew that's where the Elder wanda allegiance lied, Snape saved him by not sharing that information with Voldemort.
Mrs Weasley could be so, so cruel. To Sirius and Hermione and I'm not sure who else but it's there and it's nauseating<<<i agree, there was a time when I wanted to jump in the book and knock molly-wobbles' face.
Creation of the Marauders Map. >>>> It's because the map doesn't rely on vision. It shows people's physical place, which is still possible to find if you are under the cloak. Death could not find people under the cloak because Death was relying on vision.