The most underwhelming villain defeats you've read?

A few days ago, I've discussed with other people of a particular scene in last volume of The Wheel of Time, A Memory of Light: Lanfear makes everyone believe in her redemption, just to try to kill Rand, and Perrin ends up snapping her neck. This already was underwhelming, but then, ten years later, Sanderson revealed that Lanfear was actually alive and tricked Perrin.I have read the online reactions only recently and I had no idea that this revelation was so controversial!

But he made me think that, as much as I love The Wheel of Time, many of the Forsaken ended up quite disappointing. You have powerful scenes like (Spoiler The Gathering Storm) Rand balefiring Semirhage to protect Minand (Spoiler A Memory of Light) Lan killing Demandred after an epic duel, ending up on a badass line, but then you have characters like (Spoilers all the series)Be'lal, Rahvin and Sammael whose death I barely remember. Special mention to Asmodean who had potential for more.

For a more recent exemple, as much as I've enjoyed Mistborn Era 2 and its ending, something bogged me about the final confrontation. Wax has no choice but to fight Tensin, and all the tension is built around the tough choice about ending the life of his own sister as he cannot save her... And then Tensin is killed off screen by Autonomy. What was the point of setting up a dilemma if it doesn't even matter in the end?

And the final example that comes in my mind for now Bookstones & Bonedust by Travis Baldree. I enjoyed this cozy fantasy read, with the emotional core revolving around how short-term encounters and relationships can have an important impact on our life. Its biggest flaw is that, contrary to Legends & Latte, the book had an antagonist to defeat, and this was a big dissapointment. Varine the Pale has such a cool design, with hints of a tension between her and Viv, and then she is defeated in litterally two pages, trapped in a book like a stupid cartoon villain.Either you stick to the cozy vibes, or you build up more the relation between the characters and the final confrontation, but this half-baked result left a sour taste in my mouth for an otherwise nice read.