User blog comment:TheTobarMethod/HP Stacking, This Is An Issue/@comment-3014924-20130215122334/@comment-5791947-20130215182929

Long time ago, bruisers are stacking armor MR and health, people are complaining how they can deal a ton of damage and still be nearly as tanky as a true tank. AP casters can't touch them, AD carries take a while to kill them, you literally want the whole team to focus the bruiser melting your ADC's face.