Everybody criticizes Isekai, and for good reason. They're formulaic, feature really obnoxious characters, all look the same, and can often be misogynist power fantasies. On the other hand, they're very popular so they must be doing something right. Do you have any isekai that you think are really good, in terms of being fun to watch, artistically worthwhile, and not leaving you feeling gross afterward?
A couple ideas:
Inuyasha - this one's older, from when Isekai stories were usually Shoujo instead of Shonen. It's way too long, but has fun characters and cool monsters.
Tanya the Evil - "The Nietzschean Isekai". I won't spoil it, go watch the first five or so episodes for a wild anime ride. Unfortunately, Tanya the Evil never really progresses any further than the insane premise, so the second half really drags. Also, the art looks terrible and makes me feel terrible in my soul.
Re:Zero - Subaru's story has a lot of the Isekai tropes people hate, not least of all the character of Subaru himself. But, it's full of wild characters and bizarre situations. What I like about the plot is how it makes you think about the different perspectives of the characters as you uncover the reasons for their surprising actions.
Here are some that I can think of off the top of my head (not necessarily anime tho)
Ride-on King is an isekai manga about a Putin-lookalike, ruler of fictional Russia who love riding animals transported into a fantasy world full of fantastical beasts that he'd would love to ride on. The art is great, the world building is surprisingly detailed and seeing the native population's reaction to a shirtless, jacked middle-aged man bare-handing monster and people to death is amusing.
Ascendance of a Bookworm is about girl who love to read book, reborn into a lower class family in a densely packed fantasy medieval city. The story focus on the everyday life aspect of a fantasy medieval community and the girl struggle through it. I haven't watched it but heard it's quite decent.
Worth the Candle is a western isekai webnovel, featuring a guy who's been transferred to what look like his unique, self-made tabletop world. The MC is put through nail-biting, tough situations one after another, fighting against different and exciting enemies, with a developed and unique cast of characters. The enemies he faced include thing like a sentient maze-prison, a murderous probability-controlling unicorn, the various masters of that world magic like a Gold Mage who gain power by hoarding gold and can telekinetically murdered people with high-speed projectile, accompanied by a Time Mage who can reverse his death,... The way he and his party get past each opponents is exciting and well thought out using whatever power in their possession, there are no asspulls or power of friendships and such. It does get a bit too hectic sometimes tho, with little times for the characters to rest.