It's all like a play. I used to do plays at school. I know everything is not real and that superman lois, lex, are all actors, some of it was made in a computer, the whole thing was made here on earth and anything taking place in outerspace was fake. Does that ruin it for me? No. I choose to believe it on a level where it entertains me and I have fun feeling the suspense of the moment and being amazed by the adventure.
Even though he's ben affleck, I actually didn't mind him as daredevil... he filled the role well enough, I think and I went along with it. If only the movie was better...
Tom Hanks, my fav actor, does it all the time.
that's why I don't think them being superstars or tabloid junk news fodder makes them automatically unsuited to make me believe them as the character. That's their job. My job is to forget the real world for a while and enjoy the ride.
Them's my two cents.
edit: Oh and check out that movie Much ado about Nothing. It's interesting...