My Opinion
Well, coming from the author of "Redo of Healer" this anime isn't what anyone expected instead it's quite good. It has some of the new elements added to it. And, yeah I enjoyed while watching it.
Story 8
The main point would be does this anime have a good story? I mean yeah sure it does have a good story. Who doesn't like a super badass assassin. The whole point this anime is based on is kinda cool. I mean almost all the isekai shows us how a powerful hero is always good & kind. But, this anime also explores the dark sides of what happens when someone is suddenly stupidly overpowered. So 8 in story.
Art 9
No complains in art & animation. The studios did an amazing job animating this thing. Each and every thing where properly & well animated. And while the fight scenes where amazingly animated all the other normal scenes where also pretty neat. And that leads up to a solid 9 for art & animation.
Sound 8
Well, the opening and ending were fairly good. The OST's where a little lacking behind. But, I am sure most of you didn't notice that thing that's totally fine by me too. The OST's weren't the worst thing I heard. They were just fine I would say. So 8 is the best choice in sound.
Character 8
Now we get to juicy part. Well, I didn't expected this anime t have this good character development. I mean I don't know how much others expected of this anime's characters. But, I seriously didn't expect anything. And here we are with a good character development & fairly decent screen time to almost all the side characters as well. So an 8 in character.
Enjoyment 9
After reading all this you might have a good idea that I enjoyed this show. And you are not wrong I enjoyed this series a lot & I think this is one of the best shows to come out this season considering the garbage shows we saw . So I would give it a 9 in enjoyment.
Conclusion
Finally I would like to say I didn't expect this much from this anime so I would give this anime a solid 8 considering all the points. And regarding should you watch it or not. Then I would say yeah if you like isekai shows. This will entertain you quite a lot.
