Kuro sugoi!!! True, her power is pretty broken but not broken?.. cuz' of lot limits and restrictions as explained
If you think about, there was Komaki who can be possessed by godS when she is asleep. Also, Sawaya who can use clouds. Then, Toyone who are friends with the tiles even with the dora [I wanna see kuro vs toyone in a dora contest xD]. Other players also has cool powers like luck base (Kaori Senoo) and sense of flow (Mihoko&Nelly), draws (Kasumi Iwato) or tenpai (Davin). Factors to be considered is also the east-south winds like Yuuki and Shino
In kiyosumi, they are pretty op in a sense. Besides from plot armor and less/no restriction or consequences, Saki has very high luck in rinshan, +/- 0 and family background , Hisa too with her hell waits, and especially yuuki with her east-taco ability that opens a freakin two tenhou.
In the side A, ignoring the bad writing/pacing of the story, I like their powers since the godS did not intervene with the exception for Toki (dunno how she got that). They acquired their power from hobbies/habbits and personalities like bowling, fishing, mountain climbing, stargazing and much more. Sorry, maybe I'm just bias since I first watch side A before the main series so I just got triggered with the opness of the side B.
Weird thought, I was hoping for the battle of the flats in the captain match but since Awai had an extreme boob growth.. Sigh..