I thought it was only so-so. Is the PSA about battered women or is it about actors who beat their co-stars?
The director should have gone for a realistic setting and shown what it's really like for someone to get beaten up. Drop the whole 'it's a movie' thing.
When Keira gets the towel thrown in her face, she looks like she wants to laugh.
But as far as it going too far showing someone getting beaten, I don't think it's too far. That's real life. Women get beat up like that all the freakin' time. Rihanna, anyone?