I just liked that characters died. It raised the stakes. In mos it was Dr Hamilton, Colonel Hardy, Faora, Zod, Jor-el, all of the Kryptonians, Pa Kent, a bunch of soldiers, countless civilians... I'm probably missing some.
In BVS it was Wallace Keefe, Mercy, Finch, everyone else in the court house, Jimmy Olsen, Anatoli Knyazev, Jack and everyone else in Wayne tower, all those people in the knightmare, all the people in the batmobile chase, the lady that got thrown under a subway train, all the people in the African village, Martha and Thomas Wayne, The inmate Batman branded, Doomsday and even Superman himself.
In SS it was Slipknot, El diablo, Enchantress, Incubus, Johnny Frost, Dr Van Criss and a bunch of people who work in Van Criss labs, that dude Deadshot sniped, all those people posessed by enchantress, El diablo's wife and kids, Monster T, a bunch security guards in Arkham, all those people in the subway killed by Incubus, that random truck driver shot by Harley, those asian guys killed by Katana, Scott Eastwood's character... Probably missing some more
In WW it was Antiope, all the greek gods, Ares, Steve Trevor, Ludendorff, a bunch of german soldiers, that entire village of people that got hit with mustard gas, the guy in the gas mask killed by Dr Poison to test her formulas, the sniper tat got wrecked by Diana, that spy that ingested cyanide, that meeting room full of German military leaders...
Who dies in JL? A random scientist who gets her neck snapped, a few amazons, a Green lantern, a bunch of parademons and Steppenwolf.