The only thing I've seen is DD flip over a limo which isn't far fetched for comic peak humans
When did he bend steel bars? Can someone show this? I'm not even going to address the the crumbling a bar bel because I'm pretty sure that never happened.
I dont remember Riddick doing anything superhuman from the movies, personally (in fact, in Pitch Black, he was pretty much holding his own against the normal human level mercenary/cop/bounty hunter guy).
In Pitch Black, without a weapon, he killed a predatory alien capable of killing a human in seconds.
In Riddick, he shoved a tea cup into a man's sternum hard enough to lodge it in several inches. He also forced a knife through Necromonger armor.
Most of his feats were endurance/durability though, like getting shot with a gravity gun and surviving after getting blasted roughly 20 or so feet away and bouncing off of a small boulder.
As for Dark Fury, he's blatantly superhuman, like moving at blur speeds and such.
Above feats from the films dont scream superhuman to me. Impressive to be sure, but now what Id call above peak human (especially movie-reality peak human, which we all know is above what reality-reality humans can do).
Of course that very scan describes how Matt used his super senses to pick the weakest point in those bars, and with adrenaline adding to his strength, he bent them at those points. I could see a top athlete bending bars at their weakest points if he was really pushing himself. Him crumpling up a weighted barbell is just silly though, especially since DD has already been about speed and agility over power and strength.
Only thing remotely superhuman thing I recall from pitch black is him pulling what appears to be several hundred pounds of gear while running to that ship.
He barehanded killed that alien. That's easily superhuman considering a grown one could lift a man into the air with no effort, and eviscerate him with even less.
I checked a website that documents in chronological order all of the Riddick stuff from the movies, video games and anime. Supposedly those power cells Riddick was dragging in Pitch Black were 200lbs a piece. Iirc they had to run one mile to the shelter and he had 3-4 power cells.
He's pretty phucking strong. He also may possess pre cognitive abilities. He definitely has super human senses. According to the doc that shined his eyes riddick could smell pheromones released from your skin, hear the blood running through veins and sense your presence within a half mile radius. That's how he knew that Jack was really a girl by smelling her period blood.