Tears of fallen kingdom just outnumbered every advantage Genshin had:
- Hot guys - always were there but now more
- Hot girls - check (it)!
- Interesting plot - here, at the cost of original canon one
- Gacha addiction - here too
- interesting bosses - yep
- Being free - depends :>

(Please no additional spoilers in replies, I didn't get through half of the game yet)