I actually like this quite a bit. I remember reading all of this in the novel around 2 years ago. It's a pretty interesting story with a mc that is likable and OP yet limiting himself a lot in front of others to avoid the worst of the trouble that comes along with getting found out as a legendary figure. It's pretty realistic to some extent and the characters feel real.
However, one of the big drawbacks in the manga version is the art, the princess looks extremely ugly and the rest of the females just aren’t that pretty even when they’re supposed to be super beauties. As for the males, I don’t care as much there, but it still bothers me how they’re kinda ugly as well. The biggest issue is probably that all of the characters feel weird and twisted, the expressions aren't natural, neither are the poses etc. Kinda sad, the story could’ve been more immersive if the art was better and yes, the art DOES matter, I will never be able to enjoy old manga even close to as much as I do newer manga even if the jokes and story is funny. Not saying the art style has to be the same as everyone else, but it has to be clean and nice with natural expressions that fit in if I am to enjoy it to the fullest. There’s actually novel illustrations with the stats etc included with the manga for some reason which shows how they SHOULD look, you’d get surprised at how different the art in the manga is at some points, like the princess who somehow got pimped up like a christmas tree with huge, swollen red lips and tons of makeup, making her look more like a slut than anything else despite being cool in the LN illustration. To be honest, the background art is nice and pretty clean even if the character art sucks, weird. I’d have to say I prefer the novel version since I can imagine everything for myself there and things just seem A LOT cooler than when illustrated by this person.
Other than that, the mc’s desire to return home pisses me off. I hope he’ll stop with that bullshit and decide to stay here, who in their right mind would leave a world where they’re all-powerful, have extremely long lifespan and has tons of friends and a life they could never even dream of in their original world? I always get disgusted by the logical fallacy of japanese protagonists wanting to “return home”. Come on. I’d understand if they were having a bad time or if they were actually just in a real game where everything is artificial, but they’re pretty much always living the life while getting more than anyone could ever wish for, making it impossible to relate to their supposed longing for the uneventful life where they can't affect anything and live day to day working hard while trying to get by with a normal salary and being completely worthless to everyone in the world. Back when I read the LN version of the new gate, just a few volumes was released(though it did cover everything that has happened thus far in the manga), but now pretty much three times as many volumes have been translated so maybe I can get the answer to if he plans to actually stay in that world or not like I’m hoping he will. Reading this manga got me in the mood to go back to the LN again and read all the new stuff, haha.
So, it's worth a read, no doubt about that, but expect nothing much from the art in the manga. Also, there are better novels and manga out there, but I still feel like it's a good one to read if you want something to waste some time on and you like the general idea of the story.
Edit: The manga is fairly good BECAUSE it's shallow and quick to read, you won't notice the glaring flaws as much. Just read the novel again and it's just NOT worth reading more than a few volumes of. Go for the manga version if you have a choice. Volume 5 and volume 10 are especially bad for the novel version, decided to drop it around volume 5 but I somehow kept up to volume 10 before truly dropping it because I was slighty interested in certain things and had nothing to read, but the romance just gets worse and worse and worse and the mc too, the story really turns out to be nothing but crap as well.