I personally don't think it's "wrong", I just feel that it's most definitely a defect.
I also find all these "genders" and "sexualities" very confusing and alarming.
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The problem here is with words. A 'defect' only makes sense in relation to an assumed purpose. A hammer is defective if the head drops off because you can't hammer with it. People don't have a purpose.
'Wrong' is only meaningful with respect to some moral code and this is almost entirely subjective. You can define 'wrong' so it includes transexualism and you can define it so it doesn't. It's all up to you.3