I know, I know, a lot of people rank her high, but I've seen her really low on tier lists (let's not get started on these, but it's also reflected in general discussions about her). She's generally seen as a A-B character, not mingling with the S tiers. A lot of Chinese players rank her as S tier, but that's mostly for the combo with Venti and I ain't got no Venti. There are a lot of 4* people value her less than. And I was also pretty bummed out when I got her due to that.
I tried to read up on her and the general consensus was that she is a good versatile pick but not really amazing. The typical jack of all trades but master of none. Kinda meh DPS, okay healing, the worst VV user in the game. For sub-DPS, take XL, XQ or other sub-DPS, for healing take Bennett, Qiqi or even Barbara and for VV Sucrose is just better. Kinda felt like a waste. But I really liked her design and liked her versatility, but mostly throwing abyss mages into the water in the overworld lol. That was literally the main reason I leveled her, because even if she's not amazing, might as well have fun, right?
Right. But also wrong. She's freaking amazing. She literally carried abyss 11 and 12 for me. And in and out of abyss, she is a loyal companion. I leveled her up to 80/80, so I can lift up lvl 100 mobs with my E, she has a festering desire and really trash artifacts (a random VV set with +8-+12 and one ER sands at +12). And her E as a CC, her fall dmg (OMG YES) and her heals/cleanse are insane. It sounded like she was mediocre at all these things, but she's not.
Some of her strengths: