I sympathise with your dislike of Ginny, because she really lets Harry down here, taking the easy way out. This is how I see her character: on the one hand she is a spoilt child. Being the only, longed-for daughter of Molly Weasley she is bound to have been coddled and humoured to a great extent. On the other hand, having six older brothers, she has certainly developed a tough, tomboy side, learning - too well perhaps - to put her feelings aside not to become a sissy in her brothers’ eyes and risk being left out from their play. Not to provoke her brothers’ contempt by showing weakness might have been very important to the little sister. 

I believe that Ginny might be quite funny to be around, being spontaneous, straight-forward and lively. She is also beautiful, with that naturalness that would be rather sexy. Harry, once he has formed a strong bond with someone is not likely to let go or forget about her - I guess he really loves her.

Naturally this decision of hers to allow herself to be Obliviated is disastrous and in the long term, even with the aid of magic, it should be impossible to postpone the necessity to deal with the traumas of life…