Both. Cookie cutters especially for the women, but even when they are written well outside the a standard world they react the same way to the MC, which is either overwhelmed by his magic penis or possessing bulletproof love for no reason, like on the level mind rape magic.
The MCs fail consistently, usually being a playboy dressed up in some way, secondly would be the weak vulnerable nice boy, both are tiresome and others have already pointed out there flaws.
But even if the author manages to avoid this or makes a story interesting despite this, they still lose because the harem becomes unrealistic in practicalities. Like I was skimming one where a teenage boy had almost ten women. Never even gave it a chance, because none of them had jobs, none of them came from rich families, how are they eating?
Even if that is too nickpicky, orgies are not puppy piles, especially if there are multiple new people, there’s usually strategy and tactics involved, and most often discussed beforehand. I don’t care about this if I’m reading a sexy story on a porn site, but a web novel I read over weeks, or a story that takes place over months or years? Bothers me.