Night = avoiding fights. Night = only fun because you want to sneak up unseen and shoot AFK cons. Night = avoiding all detection, avoiding all enemy that can remotely have a chance of harming you, do something without any danger to yourself.
Night = for strat porkers that don't wanna get caught while bombing defenseless targets.
Night = for folks that don't want to lose a fight to an enemy, so they fight at night where the enemy can't see them (while they jack their gamma up through the roof to see highly washed out colors).
You can do all that offline, with the same results. The offline drones never see you coming. Oh, and they're no threat to shooting you down so you can bomb all you like.
Remember, night = when 90+ percent of the arena logged off. Hell even DUSK caused most of the server to log. I know. I was there. I logged with them.
Night = lame.
EDIT: When HTC locks the gamma and automatically compensates for individual monitor bright/gamma settings, counters video card control panel color adjustments, and locks EVERYBODY into the same level of darkness, then talk to me about how fun "night" is.