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.
YMMV: Harry Potter and the Nightmares of Futures Past
Base Breaker: For the same reasons as Team 8. It's partly due to both fics' overbearing popularity, but a number of readers simply dislike the way in which many events and characters are depicted overall (and this isn't just limited to Shipping). You're either going to love this fic, hate it, or respect the auhorial style while disapproving of the plot. No other grounds seem to exist.
As opposed to Dumbledore, Snape is treated without the faintest trace of sympathy and frequently uses his Legilimency to Mind Rape Harry (or try to) and the other characters. It's implied that Snape might have used his Legilimency to implant self-destructive impulses (namely Harry's "saving people thing") in the original timeline.
The Dursleys don't exactly get off lightly either, especially Vernon.
Lucius Malfoy is even worse than in canon, if that was possible.