Kishimoto is a sexist individual. That is the only answer I can give as to why those females (and many others) simply do not stack up against the males.
He never gives them any powerful abilities or anything, and most have abilities directly pigy-backed off of something/someone else that can do it 10 times better.
Sakura - Heal and super strength (unimaginative and piggy-backed off Tsunade)
edit: Tsunade and Konan are probably the best females he has and Konan's ability is paper oragami for god's sake.