The Saving Connor series is one of the longest and most impressive feats of world building found in HP fanfiction. This first book feels a little rough as the author gets their world and characters defined, but the language and grammar are impeccable. The angst can be a bit thick and the characters can be fairly intense, however, as the series progresses, the character choices in the first arc become more clear and serve as excellent contrast as they grow. As for the world, it is the most well thought out and fleshed out version of the wizarding world that I have ever encountered . The author fills in all of the cultural subtleties that often feel missing in cannon. Dark wizards have a reason to be dark, beyond blind prejudice and inherent evil. They have their own cultural history and tradition that they follow, and dark does not equal evil. The same can be said for the light wizards, they have an equally compelling backstory and motivation. This series also happens to include the most interesting portrayal of necromancy as a sub culture that I have found in any fiction. This series is, for me, truly the gold star of effective and compelling world building in the HP world.
I like everything about this fic, except the way that Draco Malfoy is written. He is so immensely irritating in this that I literally had to rage quit. If he were a villain, it would be one thing, but he's supposed to be a good guy! The pairing is HP/DM! But he's the worst little shit, who treats Harry incredibly badly, and Harry just... takes it. I wish wish wish I could overlook this because I really do like everything else about this fic so much, but every time Draco is on screen (which is a lot) I just get so frustrated.
It's been a while since I've read this story, but I would consider it a classic of the fandom. At times the relationships and fic overall were a bit too angsty for my taste, but the story was overall excellent. The plot, characters, and especially the worldbuilding were amazing.