Monogatari is the best harem, but I wouldn't call it haremshit.
Pic related is my favorite.
Ken brings it on himself by being obnoxious with his desire for a harem and generally counterproductive to anything they try to do, but proves himself as a hard worker who also brings fun to the student council and gains their respect. It's just a little unrealistic bullying now and then, not abuse.
Tenchi Muyo, and most related series.
Because they're actually harems.
aww that's gonna burn, I can see the smoke from here.
Harem is by it's very design a shitty genre. The concept greatly limits the plot and dooms all character's to be shallow and never develop.
Therefor the best harem shows are those that borrow heavily from other genres. A harem adventure show, a harem action show, a harem mystery show, all of these would have more potential than a plain harem show.
Why would anyone be sad Kirino won? Kyousuke clearly established himself to be as much of a shitty, toxic cunt as his insufferable sister, they should be together until she inevitably cucks him because she's a shallow whore.
The best answer is likely monogatari but harem taste is just personal preference. A 'good' harem for me is just cute girls with an art style I enjoy that doesnt take a steaming shit on everything in sight.
Love Hina was terrible but I loved it because it brought back nostalgic naru boners from the manga. Highschool DxD makes me want to cringe so bad and I wanted to drop it right away but its one of my favorites now because Rias and Koneko are too based to drop.
Best haremshit is just whatever you enjoyed watching the most