You are right, but it's something you can deal with
1. keep the Mob snared, allways
2. root if nessessary
3. if that is not enough to keep Aggro on the Ranger, spam tangling weeds and DoT the mob
4. if PET dies, Ranger Tanks, or, if the Hits are too hard, kite it
I dont box tho, should be 2...