It has to be something that you enjoy or that at least you can tolerate. I'm not a PvPer (I play on a PvP server because my friends are there) so I stayed in instanced zones and avoid the other faction as much as I am able to. Then again I have a mixed group that would not fare well in PvP anyway. My guess is that leveling will usually be quiet with the occasional owning of same-level characters and the occasional camping by higher level characters. But if you get one of those stalker types on your case it could get really ugly.

But some people don't mind that, they can deal with constant ganking and camping and it doesn't bug them, whereas other people will get upset and frustrated. If you are the latter, I don't think it will be worth it.