The animation isn't the strongest but it's not so bad that it's distracting. Thankfully the anime is based off of strong source material (I'm a fan of the manga) and while they're condensed a rather text-heavy, exposition laden story, they haven't done so in a way that is detrimental to it. If anything, it's easier to keep the various characters, and their ever-changing names as they level up, in line.
An accurate adaptation of strong source material coupled with high-end animation. Definitely on the must-see list if you're a fan of the comedic "He's so overpowered" isekai sub-genre.