Well, I don't think Robert is rubbish, I've seen him in a couple of things & he's quite good, however, to say image & looks arent important is a lie. The whole damn entertainment business is about looks, this isnt the novel anymore so physical appearance counts quite a lot.
I agree that in my head, Edward is perfect & Robert ticks none of his boxes physically but this a movie, so what do you expect? I guess I'll say I'm disappointed but I can't judge until I see the final result.
And, the audience arent just young people, I'll wager that it's not just twelve & thirteen year olds who are looking forward to it