They ruined any chance of blasters doing any kind of serious damage without having a tank on their team. WIthout a tank taunting, a blaster really doesn't have much chance since ALL custom mob range-attacks out-distance most of the blaster's range attacks. So, once a blaster engages a custom mob, then they're under tons of fire at long-range and with squishy hit-points, they're only defense used to have been keeping range. Now that defense is gone, and blasters are about as useful a tank without resistence/defense, they're sitting ducks.