I think Shizune is alright, she's a versatile ninja who would make the cut for a chuunin hands down.
She's worthwhile at melee range, has needle spam for range, can do all the basic stuff like replications, and has several killer techs like poison mist breath. also apparently some healing (she offers to heal tsunade from quite a poor condition)
And her breast size is still sort of pending.
Kabuto's fighting is always flawless, except when he was needed for a display of Rasengan. and this is about female ninjas anyway, dont compare to him.