Isekai Bastard--referred to as IB from here on, is a game with an identity crisis. The title and the overview would imply that the game is quite negative, and that the main character is a "bastard", hence the title. It makes you think that you play as a smarmy little weasel of a prick who does things to warrant being "treated like a loser", like it says in the overview. The instant you start the game, you find out that the overview has, perhaps unintentionally, lied to you. The MC is in fact not a Bastard, he's just a depressed young man with a porn addiction and a very, note: VERY, poor sense of hygiene...
The dichotomy between the players' expectations and how the game plays gives an almost whiplash-like experience. There's romance where the MC should be a conniving schemer. There are supporting characters being NICE to the main character when they should be beating the MC down. In reality, the only negative trait the MC displays is his porn addiction and his atrocious personal hygiene... This is not an underdog story where the bad guy wins; it's this weird amalgamation of romantic and gross, all sandwiched into one story.
Mechanically speaking, the game is also a pain to experience for a different reason altogether. There are no auto-saves (last I checked, there weren't anyway), and there's no rollback. Pair this with a story that takes literal HOURS to trudge through, and you get a very unsatisfying viewing experience. You reach a section with a multiple-choice question being asked of you, and the answer you choose doesn't feel like the right one after you think about it later. You don't remember when you last saved, but you know it was a long, long time ago. Your options are to keep playing, knowing that you made a wrong choice and feeling all of the anxiety that brings, or you load your save and potentially play through EVERYTHING you just played for potentially a full hour or more, only to still not know what the right answer is, or accidentally skip through the context to the question.
All in all... it's not all that fun to play. There's way too much skipping and begging the game to skip faster because scenes need to repeat for what feels like 10 times to make progress, and the lack of quality-of-life AKA Sanity-Saving functions is borderline unforgivable... but it's still not the worst game i've ever played. The story and character dynamic aren't what was advertised, but im willing to give any mind control game a college try.
Average: 3 stars.
If the game is fixed to the point where my sanity doesn't file a restraining order against me when I play it, it will get 4 stars.
I doubt it will happen, but if the character dynamic changes to match the "little creeper" interaction like I and most likely everyone else were expecting, 5 stars.