I share the sentiment of everyone else, pretty much, though I was less surprised about just how good this game turned out to be. I've been a fan of Mihoyo since the early days of Honkai Impact 3rd, so I knew their style of presentation going in. Even though I knew how capable they were, it's still insane to think of the pure scale of this game, comparatively. I'm AR32 going on 33 and I don't think I've been this focused on a game before, maybe ever. The world has so much detail, you can climb over mountains and find new wonders. None of it seems to repeat and it's always fresh, at least in my eyes.
It's a large map too, two city states currently which will likely expand to encompass all of the elements in the game. So, a minimum of at least six. Rumors are saying that the next update 1.1 will contain an area equal in size to Liyue, the current largest city state in the game. There's a bunch of secrets, too. Puzzles and ancient ruins that contain treasure chests scattered all around the map.
I've started hitting a point where I've got no quests to do, so progression is slow, but knowing that more content is on the way gets me really excited. I only wish the co-op was actually worth playing, because as it stands it just feels limiting. When you enter someones world, you can't open chests or do your own quests, so you're just acting as some improvised bodyguard to the host. You can fight bosses and do Artifact/Material grinding through co-op, but at the point I'm at I've plateaued because I can't level up my characters further until I hit AR35, and my Fischl just cuts through every boss and every dungeon like it's nothing regardless. It makes Co-op seem pointless.
Gacha is nice, you don't truly have to focus it, but whaling is always an option. Really, it's barely a gacha game in all honesty. Most gachas stike a balance between doing gacha and playing the game, a near 50/50 balance. Genshin mostly seems to be a 70/30 split between gameplay and gacha. It's a genuine game with gacha elements stuck on top, and I can guarantee you can have fun exploring the world and fighting without spending any money.
Give it a try, it's free and you won't lose anything if it doesn't click with you. Personally though, I find it wonderful.