I just found this crap again on IsekaiCentral, so I just want to clarify something:
The immense low ratings aren't, at least, JUST because "omigord deh slavery is badz" -- if the MC was an anti-hero whom had the personality that'd actively benefit, and enjoy, the suffering of others -- it'd be appropriate for the theme of slavery, and there'd be nothing wrong with it.
(otherwise, it'd be like complaining that an NTR doujin is NTR. Don't read what you don't like...)
But instead, the MC is a basic-beta-lazy-passive-retard-arse Jap MC. The only reason he took up Slavery is because a purty elf waifu did so before his eyes. That makes him as interesting to follow as it is to watch paint dry.
@Asriel
If you want to argue with people about something,
at least read a dictionary first to make sure you're not speaking rubbish...
Harem =/= Haram, but it is derived from it. It is "forbidden" more in the sense of "any other male to approach", other than the master of the house.