As a book reader I just felt like I have to write a review for the first few episodes of my favorite isekai show.
There won't be any hard spoilers ahead but you should have watched until episode 4 before continuing to read this.
-First and for me the most important thing: Characters. (7/10)-
While I am not a real bookwoorm and dropped most Light Novels, Tate no Yuusha was the only one that kept me reading up until the 13th Volume now. I love how deep they go into Naofumis personality and how the readers can follow his thoughts and changes over time.
That is where the anime
makes a major mistake. Maybe it's because the anime is supposed to target younger audience as well, but they just ruined the most important thing about Naofumi - his anger. His cold and "brutal" side.
(spoiler until episode 4 from here on!)
While the studio did show the most important things and delivered well on that part, compared to the novel it was not even close to enough. Until the point Raphtalia held Naofumi in the her arms in the arena there was much more going on. Naofumis personality was also not as "friendly" as in the anime. you could always repeatedly read his thoughts about how much he hates the people, the world and even raphtalia was just a "thing" for him to use. He only thought about the benefit for himself and trusted no one.
The anime scratched a bit on that but compared to that hate and anger from Naofumis side shown in the book this is really nothing and makes the tear jerking end of the first book (which was the end of episode 4) sadly nothing if you compare the anime with the book.
Edit: Starting episode 5 + 6 and going into the new arc they adapted perfectly in my opinion. Feels all a bit rushed but the pacing is still fine.
The story itself is nothing new of course, but in my opinion, together with the slime anime and arifureta (light novel) the most solid isekai "world" with the most enjoyable environment and deepness in skill/magic/classes content yet. They went really far with the combat + class system which makes the anime feel an actual mmorpg. Sadly the anime doesn't go much into detail of all the skills and shields (yet) like in the book.
-Sound & Art (8/10)-
Nothing bad to say about the art and music. Pretty solid animations and the music was always fitting. A good but not outstanding effort I could feel while watching.
It is a good show, but if you like the "antihero" theme more than shown in the anime and like it a bit less shonen-like, I recommend reading the book. It is a true masterpiece and much more detailed and even a good ammount of darker than the anime.
I've also started the manga at some point after the Novel but dropped it really fast again because it lacks exactly the same things as the anime and was only adapted with a very american cartoon (but not bad) drawing style which didn't fit in my opinion.
If you find any grammar fails sorry for that, english is not my main language.