Hmmm...

Gladiators to ‘fight’ again at Rome’s Colosseum: Fights will be serious and historical — not a ‘Disneyland-like attraction’

I don't think they'll be able to capture the brutality of the games, much like a Civil War or mediaeval re-enactment just can't quite capture death, plague, and the general tendency for life through much of our history to be 'nasty, brutish, and short' as Thomas Hobbes asserted man's natural state to be.