Qiqi is still on my main team & I keep thinking all the people who dislike her just haven't sunk many resources into building her. Which--hey, if you don't like a character you probably shouldn't sink a ton of resources into building them! But also maybe realize a poorly built & neglected character isn't really a good basis for judgement? But that's just my hunch.
Qiqi is not the best unit--she really needs some added utility--but she is totally *fine* and fits into a lot of teams fairly easily... she heals, she has ok-if-not-great cryo application, and if you've stacked attack and physical damage like you should, it's very easy to freeze enemies and bang away at them with her very fast & reasonably hard-hitting auto attacks. I've still got a ways to go with mine but she's 86, with a pale flame/glad combo, good crit stats & a Flute & I'm always happy to swap to her. And she'll only get stronger!
Though most of my energy these days is on leveling Chongyun (71 now) and Mona (just did level 60 ascension) & this week I've leveled talents for Zhongli (meteor is 8) & should nab level 8 for Xingqiu's burst today as well. Back half of the week I'll focus on artifacts.