Well when it comes to ranger’s being worth something in a zerg, anet still have not address the main problem and that is that pets can’t survive for long in high amounts of aoe so they die quite quickly most of the time. Once your pet is dead you are of limited use.
Hunter’s in WoW had the same issue with their pets and Blizzard fixed it by giving pets an always on buff that gave the pet 90% protection from aoe damage, it worked well and anet need to do something similar if rangers are ever going to be take seriously as a class in this game.