What makes a good Datapack good in my opinion is, a Datapack offering something that Vanilla Minecraft doesn't offer, along with something that inspires creativity and something that actually works, I won't use the word useful as what's useful to one may not be useful to another.

I'm kind of torn between new mechanics and utility in this poll. I know there's a data pack that shows coordinates and what direction you are facing, and that's kind of what I look for - tools to help me.

I like when datapacks include models of stuff (Chairs, tables, furniture in general) but that the furniture stays true to the vanilla kind of look. Så instead putting in a HD super detail chair, then I'd rather have some low pixel, simple wood chair, with maybe some wool on the seat as a cussion :)

For me it's seamlessly fitting the vanilla feel/mechanics. Same with mods; I love it when they don't alter the game completely, just add to it in a way that feels natural. 😁