Honestly decent Harry Potter fanfic: Hermione starts out a math genius and things escalate. Good writing, a bunch of very thoughtful world-building. Close to canon without being stupid or pretentious. Delightfully nerdy, good research. Overdoing the canon in places, I think, and also the meta fandom commentary (but not often and not obnoxiously).

Last part of the trilogy. Not bad per se, but far from good. A collection of "look where I could take this" stories, loosely connected. No urgency or impact, really. Better than the original epilogue, but what isn't.

Second part of a Harry Potter fanfic. Better plot elements, maybe, but worse writing – started being a drag at some point. Still good execution on the theme of "what if science nerd, but Hermione" – several leagues more plausible and readable than HPMOR. I still like how it quotes extensively from pop and less-pop culture, and how it integrates then-current events.