I really like shows that respect their own rules. I absolutely despise inconsistency and plot holes.
So if you know any anime that are perfectly - or almost perfectly - consistent with thier lore, recommend them to me.

To give you some examples, here's what I have liked:
SnK : Pretty nice. The curse of the titan powers are really fleshed out and the author has used them to make great twists, love it. I hated that "transfer consciousness" shit though.
HxH : The Nen power system is very detailed, I'm a huge fan. Nen becomes stronger under harsher conditions, even stronger in death, very good. But I hate that the "specialist" category exists, it just lets the author dump it with potentiall asspulls.
S;G : Very good implementation of time travel. One must be aware of paradoxes and avoid them. Even if you change the past by saving a person, someone else will die, marvelous. But the "convince yourself that the past happened in such a way so that it actually happens in another way" kinda bugged me off.

And here's some things that I really hated:
BnHA : OH MY SEVEN QUIRKS. I hated how the protagonist was being mind controlled and just twitched his fingers to free himself. I hate the quirk system, there are no limits, no restrictions, nothing. The author can just dump all the asspulls through quirks
Jojo : Don't even get me started. OH MY SAME TYPE OF STAND. OH MY MOBIUS STRIP. OH MY GOLD EXPERIENCE THAT'S ACTUALLY CRAZY DIAMOND. At least Part 7 was cool.