Ireth
Myth Weaver
It... depends a bit on how you use the prophecy, I'd say, and how prophecies actually work in your setting.
Agreed. Harry Potter did this well, I think, with the ambiguous nature of the prophecy surrounding the one who could defeat Voldemort, and having Harry *choose* to go forward and try to fulfil it.
That said, one of my biggest pet peeves is the love triangle wherein one of the hero/heroine's choices is clearly far better for him/her than the other, yet he/she still chooses the one who's bad for him/her. If you're going to have a triangle, at least make it an equal-sided one, amirite?