Oh, I don't like the twins; I think they need a good kick up the backside. Clever, but no sense and no respect for anyone else's feelings (poor Neville)
I don't really count Hagrid 'grown man' anyway; he's mantally not any older than the Trio. I always considered the 'leave it up to Harry' as story-neccessity; if Harry did what Hermione's always telling him to and went to the grwnups, the story would be a lot shorter.