TL;DR Go for the waifus/husbandos, but be disappointed by the bare-bones comedy, forced and underdeveloped romance, as well as the simple plot and characters. But hey, it's a 5 for me because I enjoyed the VA cast, great character designs, characters fighting over Catarina, and sometimes heartwarming yet essentially still cheesy, simple backstories.

While it has barely started, I'd suggest the spin-off manga instead for its unpredictability, which the original lacks. (And despite my criticisms, you'll find me watching the 2nd season for sure. I'm as simple as I can get, what can I say?)

Hamefura starts with an interesting premise in its setting being an otome game, but more so on the fact that the protagonist is set to be a villainess bound to either exile or death. Thus, what drives her actions is to prevent those "doom flags".

However, I should tell you now that the story could've ended by the 3rd episode. Katarina had literally managed to avoid the doom flags by that point simply by befriending the insecurity-ridden characters, so the episodes that come after are really just the romantic interests trying to get with the dumb and dense Katarina. Sure, you might be surprised by how the story turns out at the last few episodes, but it's as simple and predictable as it can get (worse, a deus ex machina occurs).

It's due to which that I find the spin-off manga much more interesting, as Katarina starts in 'hard mode', AKA at 15 years old and in the original setting of the otome game. The characters aren't head over heels for her, what happens next and how she deals with these events are unpredictable, and the doom flags are as such still looming. But anyway...

I don't watch much isekai to also know if this is commonplace and a boon or a bane, but the world lore and the concept of magic aren't as explored. I'd merely justify it with the original setting being that of an otome game, where the point is to get with one of the guys. (I also don't play otome games to know if the justification is okay.)

In any case, as many stories, Hamefura's redeeming but also make-or-break factor would be the other characters (AKA the romantic interests)—not just guys, but girls too! It shines with its very well-designed characters (cough Maria, Sophia, Nicol), though I can't say the same for the actual world and, well, the characters themselves.

I love harems, but god, the characters are as stereotypical and simple as possible, who surprise surprise are all in love with the immensely dense Katarina.

You have a guy...

1. whose only personality is that of a flirty fiance of Katarina (worst choice out of the bunch, btw);

1. who became a siscon because Katarina made him feel welcome (not bad, but you're expected to have that and the fact that he's adopted as justification as to why he harbors romantic feelings);

1. who stopped becoming competitive and insecure thanks to Katarina, though he becomes lowkey tsundere (surprisingly the best out of the bunch); and

1. who's considered devilishly handsome, but he hardly ever talks. He somehow falls in love with Katarina solely because she doesn't treat his sister as a nuisance.

Then you have a girl...

1. who was once shy and insecure that (obsessively) falls in love with Katarina solely because of a compliment;

1. who falls in love with Katarina because they share the same passion for books and because Katarina didn't find her looks repulsive; and

1. who (is best girl that) falls in love with Katarina because the latter saw her for more than her magic and didn't shun her; if anything, Katarina recognized and complimented her hard work.

The romantic interests each have their quirks, though at the end of the day, their entire character solely revolves around Katarina 'saving' them and loving Katarina for that saving.

What about Katarina herself? Well, she absolutely loves sweets and is very dumb, dense, and inept in magic. But hey, she's supposed to be a simply lovable, genuine character, and it's her dumb actions that make her endearing to you and it's her interactions with the romantic interests (or the interactions of the romantic interests themselves) that make the anime funny. It's nice, if only it doesn't get kinda stale.

All in all, I'd go for Hamefura with low expectations and only if you want light entertainment and minimal romance. It's not much, but it's okay. As someone who loves harems, I certainly did enjoy the romantic interests 'fighting over' Katarina, if not just innocently admiring her, but it's really the only thing Hamefura has going for it.