Cactace was my first 6*. I like her a lot, and she's part of my regular unit. But currently, she is definitely one of the weaker rainbows. If her special attack doesn't trigger, then I might as well put a gold unit in her slot, there are several who deal more damage on non-specials. So, as powerful as she may become with her bloomed form (which is still more than half a year away for us), I do think her bloomed form actually puts her back in place where she belongs, between the other 6* girls, pretty close to Sakura, BB, Mei, Fritillaria, you name it. Bloomed rainbows are all overpowered.