Finished Ascendance of a Bookworm, season 3. Overall, it's still the same anime. I can't talk from the anime-only perspective, since I've read the source material, but I think the anime is pretty decent. It's probably the best they could do with the source material using its limited budget. This season in particular feels a bit short, but it covers only two volumes of the light novel, and there are not that many things happening there, though the events that do happen are pretty great.
Still, I'd heavily recommend reading the LN over watching the anime. There are two main reasons for that. First of all, the anime skips some stuff. It's not anything major, and it's understandable why they do it since the slow pacing of a book wouldn't work here. Still, one of the things I love about this story is its attention to detail, which makes the fantasy world where it takes place feel so real. The anime manages to capture this aspect well enough, but the LN is still much better in this regard. Secondly, there's simply no way the anime is ever going to give us the complete story. The LN it is based on is truly massive with more than 30 volumes, and these three seasons of anime covered only the first 7. Honestly, I'm not expecting another season of anime at all, which is a shame, since some people consider these parts to be an extended prologue, and the latest season ended on a rather depressing note.
Talking about this story in general, it's pretty amazing. The world-building is insane, and the characters are pretty good as well. The MC actually has to adapt to the fantasy world, since her values clash with the values of its inhabitants so much. And not in the edgy Shield Hero type of way. She actually stays true to herself, though becomes slightly more flexible. Overall, it's my favorite isekai and is the perfect example that, if done right, this genre has a lot more potential than the popular opinion suggests. I recall, in the past, when I just started the book, I said that this is a story that avoids the usual isekai cliches, but going further in the story it becomes pretty obvious that I was actually wrong. As it turns out even by the end of the part that the anime covered, it actually has a lot of common tropes, but they are included in a rather creative way that makes them not feel out of place here.
Overall, if we are talking about the LN, i'd give it a strong 9/10, or maybe even higher, depending on how it ends. As for the anime, I'm pretty torn about what rating to give it. I guess I'll settle on 8/10.
PS. Also, this.