It's a love-it-or-hate-it kind of thing, which ultimately comes down to how willing you are to put up with grindy gameplay that's monetized poorly.
There's also a lack of end-game content, and you'll run into plenty of false walls along the way, purposefully slowing down your progress. Still, the monetization is greedy, and you're bombarded with all manner of sales and other annoying in-game notifications. The writing is also better than expected, and the game's characters are detailed and interesting. There are still very few mobile games that can compare a year later. The graphics in this Zelda-like adventure are superb.
Still, there's no denying that miHoYo Limited raised the bar exponentially when it comes to the polish and content of free-to-play mobile games. Genshin Impact is an adventure game that might not appeal to everyone, thanks to its gacha design.