Ele Shamans are SOOOOOOOOOOOOOO friggin' awesome at world PvP! I just love going to HFP or WG fortress while under enemy control and just causing chaos!
Thunderstorm is by far the most fun world PvP ability EVER CREATED! I haven't had this much fun since the golden days before BGs were introduced and we did all our PvP in XR or TM (except it's even more fun cuz I have THUNDERSTORM! DUM DUM DUMMMMMMMMMMMM!)
Just yesterday I successfully managed to kill 3-5 Horde multiple times while not dying once thanks to THUNDERSTORM and instant ghost wolf. I killed them by knocking them 500 feet off towers and cliffs and by lava bursting their faces and then ghost wolfing to LOS and healing! (no 10% healing debuff because it's WORLD PVP! wooo!)
Today I lost track of time killing tons of Hordies in WG fortress. I'd swoop down like a hawk and snipe some AFK guy and then run away only to be chased by DKs and NPCs. I'd AoE root them all and run away and then turn back and finish off the DKs!
I guess my point is, BGs and Arenas are over rated, world PvP is tons more fun. You have a lot more chances to use the terrain to your benefit and you can heal yourself with no penalty while still keeping the 1100 res mitigation. I've been world PvPing since last week and I'm hooked! The best places are HFP because of the terrain and the newbs leveling up you can gank until they get on their mains so you can gank them too. Also WG fortress because you can land on those towers and knock them off if they start outnumbering you. Good times.