Isn't it kind of strange to tell what ways you want her to die, and how much you hate her?
I don't like Rukie neither in Bleach, but for all I care she can be there... and doing what she does. I agree with you that she has nothing to contribute with, she's not strong (at least not compared to the other people in the serie), she's not cute, she's not funny AND she sounds like a man...
Erhm... do I need to say more? :P
Point is, I don't see the use for her in the serie as it is now, but in the start of the serie she had a mayor role since she's the one that "triggers" Ichogo's powers.