that may be true for enemies that i can one shot but it still happens on elites and bosses that require a couple more. this is especially annoying in pvp when i use snipe on a distant enemy and a knight roles up on me and i cant stun him and cast probe before he uses force sweep or master strike.
yes i do agree it is out of sync at times like when i walk into an empty room in an instance and then get rolled by the ten battle droids i ambled past before my game said they were there.