Tbqh I had entertained the possibility that your entire reason for shitting on this anime is that I severely criticized Overlord S3 and somehow you can't accept that I like this anime that you find much lesser. Quite childish if so.
That aside, calling this anime 'generic' strikes me as extremely odd. I watch a lot of isekai anime and this one very much feels unique. It has the slime-hero, which already is a huge differentiation. But following from that, it doesn't put emphasis on humans, but instead explores monsters beyond the typical 'they exist for the hero to kill'. Then there's also the plot shake-up where Rimuru befriended an, as far as I understood, evil dragon that was sealed away by a hero. That's hilarious on its own.
Those are 3 significant unique traits that imo make it impossible to call this anime 'generic'. If you don't like it, that's fine, but it's rather, again, childish to put false-nomer to something just to get a rile out of others.