5. Peter Parker finally catches M.J.
Movie: Spider-Man: No Way Home
This is a very particular entry on the list because it doesn't fail (too much) in how it looks, but rather in how it feels.
During the third act of Spider-Man: No Way Home, Andrew Garfield's Spider-Man finally has the chance to redeem himself by rescuing M.J. from a long fall, after failing to do the same with Gwen. It's an incredibly emotional moment, but one whose impact is diminished by the rather weird VFX. For starters: It's clear that Marvel is using digital doubles for the scene in which Peter catches M.J. in mid-air. Perhaps it wouldn't be so noticeable if it wasn't for the "floaty" animations of Zendaya's character while falling. But even worse is the resolution to this sequence.
Once Spidey catches M.J., he attaches a web to the scaffold in order to reduce the fall velocity and diminish the impact. The only problem? They still hit the ground at an incredibly high speed. The deceleration when hitting the ground is so sudden it doesn't feel natural. To add to the uncanny effect, M.J.'s legs wobble in an incredibly fast and unnatural way after the impact. The whole scene looks very weird even if there's nothing unpolished about the CGI itself. In this instance, it was the animation that couldn't stick the landing (pun intended).
On the bright side, it all happens so fast audiences will rarely notice all these little details. Besides, what follows is a captivating performance by Andrew Garfield that elevates the scene even further. But while the sequence still works, it can't escape from making its way into a list of the top 5 worst VFX in Spider-Man movies.