Regardless what people think of Mel Gibson, the guy has longevity. Sure, he gets drunk and occasionally rants about crazy things and his skanky girlfriend recorded him berating her over her clothing choices, but the guy can play a part.
Love Mel Gibson. Sure he's had his problems in the past, but you can't hold it against him in this day and age. Loved the homages to Lethal Weapon and Mad Max in this movie.