Norn games are more vanilla, Miel goes into the rape first but the girl likes it so it becomes consensual pretty quickly but there is the usual piercing and urination that all games have, and most of them goes into humiliation as well, it's very maledom. Norn is very vanilla, all the sex scenes are consensual and there is no piercing nor pissing. I guess people that don't like pissing and piercing are not very found of Miel games, since they always do that.
To be fair almost all complains about Miel games that I hear are that, the humiliation part(pissing, piercing) and the little variation of it's formula, so if you liked one Miel game you'll like them all and if you don't like one you won't like any of their games. Oh right I forgot, some people don't like that all of them are kinect novels as well.
I think they are fine every once in a while but I understand if people don't like it.