For a F2P game, absolutely worth it to play. There is so much free content it's insane that it's not P2P. Obviously this gets funded through the gacha system but honestly, you can F2P yourself through Genshin no problem. I try to log on daily for my missions and grind for upgrade material during the week but sometimes miss a few days, Sundays are reserved to my weeklys.
Btw I definitely recommend using the online genshin-impact-map. Shows you were everything is and even gives you a list of things to do on a specific weekday. (What talent upgrade material or weapon upgrade material you can get on that day)