24 is an *event* for me. I close the doors to the living room, turn the lights down, get out the chips and salsa, and turn the receiver up to reference level. Dialog is a bit louder than normal dialog, and explosions and crashes are as loud as... explosions and crashes.
Everything sounds awesome.. except the commercials seem to be normalized around the same decibel level as the loudest explosions in the show. So, I mute the commercials.
I watch most TV at -20 to -15.. but 24 gets the 0.