This manga is fairly funny at the start, but I honestly don't think it's more than a 3/10, good enough for a quick read but nothing memorable and it starts becoming boring after a while.
The author isn't that good. No surprise, really. It's made abundantly clear that while he's clearly trying hard, and I respect that, he's clearly failed a lot of times with his ideas and just lucked out with a concept that was fun and easy to get into. But here comes the problem, he's not trying to shuffle it up, it's the very definition of beating a dead horse, a one trick pony, the same thing over and over again. While some authors do the same joke every now and then, he rapid fires them. This is even worse because the plot is also the same over and over again in a bad way.
After a few dozen chapters, you start to notice extremely clear patterns and 80-100 chapters in, you realize that that's just how it's going to go the entire serialization. I agree with the author's own words that it's weird this has been allowed more than a few volumes.
At the start of the manga, it leans almost solely towards comedy with very little serious parts, he solves everything almost instantly with his muscles. At that point it's just a gag manga. Then he suddenly starts going into the shounen action / battle manga territory, which is ever so overdone, cliché and stupid.
The gag is always that he solves things quickly with his muscles, but honestly he's not very likable in the first place. It's a repetition of him being extremely stupid yet kind and ridiculously strong. So, after getting hit a few times, he always wins in a ridiculous way. So, pardon me for not finding the "Hahaha, he's so stupid and solves everything with muscle power" gag to be funny after the first 50-100 times, because it never changes. Some dude comes in overconfident and the peanut gallery/opponent does the typical straight man crap while being dumbfounded and having silly faces. It's enough for 2-3 volumes, but not over a dozen...
Even though that's boring, worse is that the author fails focusing at a particular kind of story. At the start, it was gag-like, but then suddenly it's a shounen battle story where he meets foe after foe and battles overpowered and overconfident people, as soon as he finishes, it's pretty much time for the next battle, but it's always solved anticlimactically with him acting stupid and doing something ridiculous, which doesn't make much sense if you build up drama and show various serious battles only for him to pop in and suddenly do gags to ruin the flow all while he's eating cream puffs and being so stupid he doesn't even understand what's happening. The jokes become even less fun as they are packed into typical shounen garbage, only really bad shounen garbage battles.
Now for the worst part... The main cast and enemies are all so god damn unimaginative, lifeless, artificial, dull and overall garbage. I really feel like the author has little talent at writing a story, I say this as a novel author myself, he'd probably do better as a manga artist adapting someone's novel. He's not considering how to make them believable or fun to read about, they're terribly one dimensional. While the main cast is really boring, at least they have some slight thought into them, though they have so few facets to their personalities all of them seem like an extreme. But the enemies... Did he copy-paste them all? Pretty much every single one is the same. He's going faaar in the wrong direction, trying to make them interesting by making them "unique" or "messed up" in appearance, with jagged teeth, weird hair, random expressions. Then the crazy personalities, every single one of them has a similar background story. it seems that "personality" and "depth" for the author is to make them all have traumas and by cheap reasoning they're batsh*t insane because of their "harsh childhoods". Every single character has some weird backstory and is extremely fixated on a single concept because they've "been abused" or "had bad luck" in some way. I'm serious, every single one, except maybe mash himself. Often mash would "heal them" quickly by being "nice and kind" because a single nice action sure can overturn an entire life of suffering, yeah. But all of their reasons are so god damn juvenile and single minded. There's only one single facet to their current insanity and they're ridiculously fixated on it, repeating themselves over and over again.
It's pretty difficult to explain, let's give a few examples. One dude had his mother killed while helping the less fortunate by those very same less fortunate (a single dude did it), after that, despite being told to be kind and help people by his mother, he becomes some kind of gene fixated freak that feels like only those who have good genes and are "lucky to be highborn" are worth jack shit, so he rambles about this 24/7 with zero logical reasoning. Another dude, not sure what his issue is, but he only rambles about laws and is so constipatedly stubborn in his views of that laws can't be bent at all in any way that you really question if he's a robot at that point, though a criminally insane one. And these people, all with simply one single fixation and one single reason for their actions, are all over the place playing "who can be the most batsh*t insane" and trying to make the world fit their ideas of what is right. Would it kill him to make some villains without traumas or that aren't insane and over the top because of it? More realistic people with stories to tell and some logic to them? People who aren't there to be evil just for the sake of being evil. At least make the background stories believable. I didn't find a single background story that was good enough to justify their personality disorders and over the top insanity along with fixation on one single thing, weird how the entire magic world is filled with these kinds of people.
Don't even get me started with how lifeless the eyes and faces are of most characters in this story. That's a drawing issue, or some might call it a "style", but I really don't like it. Most of the time, none of them even have any highlights in their eyes, creating so-called "dead fish" eyes, though the author sometimes decides to add a highlight just for fun. The eyes are windows to the soul as they say, they're a huge part of expressions and emotion in manga but the characters in this manga almost never has any real expressions or their expressions are permanent plasters, like having a "crazy face with jagged teeth and your tongue sticking out". It also provides contrast to when you actually WANT to use dead fish eyes. You're missing a lot if the only emotion you show are copy-paste "surprised/constipated" less detailed "sketchy" faces when mash does something surprising.
But, yeah, read it very quickly, don't bother reading into the battles or caring about anything except when mash shows up and it becomes a 5/10 or even 6/10 experience that passes by quickly enough to not make it that boring. Please don't care about the story and certainly avoid reading the mad ramblings of the criminally insane that just seem to pop up all over the place after a while.