slow didnt ruin b.net... it ruined PvP games...
how do you expect a baba or a smiter/charge paladin to make it to a zon when she is constantly shootin towards your general direction with a slow target item... when that first arrow hits you... you are most likely gunna die... unless you TP to town.
slow is used by newbies who can not run, stop, shoot, run, stop shoot, fast enough to stay alive...
and by koreans after they die a couple times and start scrollin and gaurdin town