I can't think of normal harems because I don't like them and have only been reading the reverse ones for years.
The best are the ones in which MC gets the best boy (who usually is her love interest).

I absolutely love that Tamaki and Takuma ended together in Hiiro no Kakera.

As for anime versions I'm open to the main girl ends up with everyone ending,

like in Amnesia .
What I will never accept are endings in which MC ends up with a side love interest because the romantic development those couples get tends to be weak. ! Like in Brothers Conflict... I have the novel and love it, but I can't accept its ending at all .

[img]https://i.imgur.com/6MBFpsv.png[/img]
ᵂᵃʳᵘᶦ ᴷᵒᵗᵒ ˢʰᶦᵗᵃᶦ ᴳᵘᶦᵈᵉ | ᴳᵉⁿᵉʳᵃˡ ᶦⁿᶠᵒ | ᵂᵃʳᵘᶦⁿᵉˢˢ

Honestly, I would be happy if the MC ends up with at least someone or everyone except there sister/brother/mother/father/aunts/uncles and maybe cousins just to be safe.