It is a pvp realm after all. High level(s) gang up and kill a or a group of lowbies(Thrallmar/Honor Hold the most common), people say its common, lol get use to it, but if it was the other way around omg omg hack, exploit, he 1 shot me with a bomb, I cant rez omg!
The funny thing is when a lowbie does something to defend, stand up for him or herself, they are marked as an exploiter and nothing more.
Something interesting I found on cata, Mop, and during the Lordaeron testing, gankers will be ganked by a level one very, very soon if I am reproducing it right ;)
Then again, high vs low, when Arena Tournament and old Nelth was around, people just dont go for lowbies, they go for the undergeared folks that do not expect to get into a confrontation with a geared to the teeth player in world pvp, mainly those pve dudes that run around picking flowers for their profession.
Long story short: It's a PVP REALM, anything goes in a PVP REALM, even GANKING, even if you bring you MAIN, etc. It is the PVP food change my friend, take the hit or log out, your choice.