Review of Death March to the Parallel World Rhapsody
Recommendation: not worth watching unless you really, really like trashy isekais. Death March is your standard "guy gets reincarnated inside a video game, becomes extremely powerful and attracts a harem of girls" anime. It never strays from a very predictable template. It also feels incomplete, or like nothing ever goes anywhere. Potentially interesting plot threads are dropped immediately. Interesting nuggets of information that seem like they're foreshadowing future plot developments, such as an early mention that not paying to renew your entry papers will result in enslavement, are simply never mentioned or followed up on again. It feels like it wasmade with a 2nd cour or season in mind, like we're just getting to the end of the prologue at the end of the series. Even the series' central metaphor, the "death march" of the overworked main character's job in the real world, never goes anywhere. You would expect that to maybe influence Satou's behavior in some way when he's reincarnated in the game world, but it does not. His past life is almost never referenced at all in fact, other than some general knowledge of video games helping him to explore a dungeon at one point. His background, his job, being overworked, none of it ultimately matters even a little bit.
Plot wise, there really isn't much going on. There are a few short, low stakes arcs, but it's more slice of life than not. The hero is a nice guy, always does the right thing, and always easily defeats the villains by literally being almost 50 times more powerful than anyone else we see in the series, going by levels. The harem romance, such as it is, doesn't really go anywhere like everything else in the show. In this case, that's for the best, since the vast majority of Satou's harem is underage or at least looks like they are. He thankfully displays no romantic interest towards any of these characters but the show itself can be quite creepy, often finding ways to show them nearly naked or coming up with excuses to have Satou kiss them for Plot Reasons (he has to transfer magic to them, you see). Only Zena's interest is even mildly reciprocated by Satou, and that's fine, but there doesn't seem to be any point to the harem he attracts beyond it being an occasional excuse for the show to sexualize alarmingly young girls.
The animation is also very bad at points. The CGI horses and lizardmen look awful and the animation gets clunky at points. Even the character designs are a bit mediocre. Visually, it's just not up to the standard you'd expect of modern anime.
Despite all the negatives, it's a pretty easy watch, especially if you like isekais and don't mind the fact that this one is completely generic. Some of the characters are good. Tama and Pochi are cute and I liked Liza and Nana as well. The characters are pretty shallow but there's nothing wrong with them. You can breeze through the series pretty fast and it's not exactly boring, even though very little actually happens when you get right down to it.
Still, there are many, many better isekais out there, you'll probably enjoy those more if you're considering watching this series. You're not missing out on anything new or unique or high quality by skipping this one.