I've tried a few eps of Iseleve and while I like the basic premise of two worlds, a down-to-earth nice guy inheriting a legacy, rpg/fantasy elements, etc and harem/ecchi stuff doesn't bother me at all...

The part I can't get into is the overwhelming OP-ness of it. No, I think I'm doing a bad job describing what it is that is bothering me... I have watched and liked plenty of things with OP characters like One Punch Man, Mob Psycho, (old) Bleach and read a fair number of light novels with OP chars like Mushoku Tensei, Everyone Else Is a Returnee (Korean), Stop! - Friendly Fire (Korean), as well as plenty of wuxia/xianxia stuff...

I think what I don't like is that is feels like the MC is literally handed everything and there is no challenge whatsoever; for me it feels a bit like a story-on-rails feeling and I don't feel really connected to any of the characters, as if they are just cookie-cutter templates with no depth or personality.

I think there have been a few anime over the last couple of years with a similar feel (there was one about a Demon King reincarnated at a school or something I can't remember the name... maybe it was this one?) and a few other isekai's.

So for you guys that like this kind of thing - I'm sorry if I'm coming off as a bit negative towards it, I honestly am not trying to shit in your cup of tea - but any insight into the appeal would be appreciated.