Tbh when you’ve scraped the very bottom of the barrel as I have with low budget sci-fi flicks, ripoff animated films, and The Room (bless it), it gets hard picking out the worst.
I guess if I were to choose a recent high-profile movie that had all the potential but failed miserably, it would be Justice League. I was halfway between falling asleep and cracking up at various things. At least the likes of King Arthur: Legend of the Sword had a nice soundtrack and some cool moments, and Mortal Engines had amazing visuals. Justice League had... none of that.
Who Killed Captain Alex, on the other hand, is a true gem.