Infinite Leveling: Murim

You already read this isekai story 100 times. The MC is your typical shonen MC, his goal is to be "the strongest in the world" (seriously ?), there's nothing special about him except that he's strong-willed and trains hard... Other characters are cliche and/or jerks. Art and translation are mediocre.
The 40 first chapters are the worst, it starts to be interesting at chapter 150 but IMO it's not worth it.

Pretty generic murim with pretty good execution, art is ass though

Quite entertaining. The writing is not the best and the character of the MC is not always consistent. I can see why it would be hard to write seriously a 40 year playing around with teenagers. This is still better written than most series in the genre.

The fights are quite well made. They do get pretty magical at later stages, but never to the level where they just become flashes of light and explosions and other nonsense where the reader can't tell what is going on or why it is happening, things are mostly comprehensible. A double jump is magical, but I get what it can and can't do and so on.

if before regression he rank around D rank, after regression he can reach A rank.. but not a S rank.
the system(quest) help him grow but he can't become OP because his

poor physique that limit his growand that's kinda a killjoy for a system user
and for a regressor with all that! memories of past lifetrait, ke keep makes a mistake that can be avoided if he really have that trait.! he only remember after something that takes place not beforekinda insignificant trait if you ask me, well at least it's not worthless

Still super entertaining' if you like Shounen with cool fights, the MC is really nice and yea deus ex machina give him advantages... YET!! he deserve it with the sheer amount of hard work he puts into the training.

What is special is the characters and the intricacy of the trama and the world, which is not as banal as others. The characters are well written and the protagonist history is meaningful.
Classic level up, with some twist and a linear progression rather than exponential. It's still interesting at chapter 100+.

MC died then regressed to his youth. Found out that he is the only one has this so called system. He could level up, collect rewards, use space inventory, see people level and stats, etc etc you know what it is.
The dumbest part is his martial arts, where

he accidentally found a martial art book that let him use handle 10 weapons at the same time, gaining bonus stats just by touching a different type weapon, and spawning new arms out of nowhere

Art is great, story is great, MC is great, side characters are great. Hell, everything is great. Go read it now, you'll not regret it.