Backstabbed in a Backwater Dungeon: My Party Tried to Kill Me, But Thanks to an Infinite Gacha I Got LVL 9999 Friends and Am Out for Revenge

That is certainly one of the anime titles of all time.
- Surprising they didn't include the end twist in the title somehow.

I'm still waiting for "I Spent My Rich Dad's Money to Absolutely Destroy My Gacha Competition, and I Have No Remorse".
- Start writing this. You'll be rich.

One of my all time most hated light novels I've ever read. I lack the vocabulary to fully explain how much I hated it. I think the closes thing would be "sawnay" which is the phonetic spelling of the Hebrew word for biblical hate. You know Old Testament shit. That's how much I hated that series.
- I have a feeling I’m about to release a torrent…. Why do you hate it so much?
  
  It's the same as "Redo of Healer" and "The Hero Laughs While Walking the Path of Vengeance a Second Time". At least in anime form you're not forced to read the deranged thought processes of the characters.
  My main problem (apart from the general low quality) with those 3 series is that the META of the story indicates that the authors see this as normal and acceptable. It's hard to explain because it's the intent between the lines. It's not portrait as something bad the character do, but glorified as if it's the righteous thing to do. If regular power fantasies are written for introverts that feel powerless, these three are written for those of them that are fantasizing about burning the school down with the classmates inside. You know the type that looks at school shootings and think "yeah, they had it coming". Or to stay anime specific, those that think burning down an animation studio is the right thing to do because they stole their idea.