-What kind of hentais I (usually) like most: Vanilla, Ahegao, Femdom, Futanari, Yuri, Lolis, Milf, Stretch/Expansion and Incest (exception: Father/Step-father + daughter).
-What kinds I don't like: Rape (except when related to funny/not serious situations), Monsters, Gangbang, Blackmail, Middle age / Old men, Creepy/Ugly dudes and NTR.
-The others kinds (such as Tentacles) I'm "neutral" about them, so, I can like it or not, depending whether it's good/well done and/or whether it'll please my taste.
How do I rate:
(1) I think that for a hentai enjoyment is the utmost factor, and right after is the animation. I know that both are bound: good animation = usually more enjoyment, however.......
(2) ......, I DO NOT use the animation itself as a factor to rate(score) my hentais. There are plenty of hentais with so-so (or even bad) animations but with exciting sex scenes and/or situations. I'll never take point from those hentai just because of the poor animation. A well made animation is a bonus, and DEPENDING I can give bonus point. "DEPENDING"? "Tainamin Asagi = 100% of things I dislike + awesome animation (in my opinion), bonus point? No. The bonus point thing is uncommon though, so not that relevant, therefore let's proceed to the MAIN item...
(3 - The MAIN item hehe):
I always put on the balance my dislike and enjoyment factors. If there is too much NTR (Rape, all those things I've already said), conseguently the score will be lower, however, if the NTR is minimum and I enjoyed the other things, the score will be proportional to it, that's why: level of dislike x level of enjoyment = my score. Remembering that the sex scenes/situations itself is for sure included in my enjoyment (or dislike) matter.
(4) Just to take a note: "Oh, it's hentai so fuck off everything else, I'm just here for sex scenes". No, I get emotionally involved even with hentais when they make the chance to do so. That's why I can't bear most of the times with NTR and all those other things." What about story and plot? You use them as factors to rate your hentais?" I rate(score) it in the same way of the animation factor, same principle.
Now, if you got my tastes and are equal (or similar) to mine:
1 to 3 and the dropped ones -> I suggest to you to don't even bother to watch it. Pretend it does not exist.
4 -> Watch it just in the last case. Only if you have nothing more to watch; only if you have already watched those ones with 5 to 10 of score.
5 -> It's not sure that you'll find something good/interesting here. (Most likely) bended to have more things that won't please* you, though (slightly) better than the ones scored with 4, obviously. You can give it a try and check it with your own eyes.
*Not only talking about genres (NTR, rape and etc), but also about art/animation, characters, sex scenes and etc.
6-> That "Ok" hentai. Nothing less nothing too much. May have something good/interesting, as well as may have something that won't please you in a same proportion. The balanced ones.
7-> I would highly recommend. Are those that are superior to the majority. The chance and quantity to have good things here that will please you is superior than have things that won't please you.
8 to 10 -> A must watch. For sure these ones will have a thing that you'll like and that will make the difference.