I mean Isekai in itself isn't the worst thing, but how utterly generic 99% of it is.

While I might be a bit biased towards old anime, back in the 80s and 90s (and probably 2000-2010 - I have not enough knowledge of that era) at least they didn't shoehorn UIs, stats, special abilities into it just as if the MC was in a game, and not just its setting.