I could try to reword a previous post by Daxx, but I'll just link it here: http://us.battle.net/wow/en/forum/topic/7320822467?page=5#85
The only thing I'd add to that is something I said over and over during BC when the big complaint was about Halaa: world PvP is not fair. We're not limiting who can do it, or in what amounts, and inherently some people will want to gank lower level players. Of course we later added areas like Wintergrasp and Tol Barad which attempted to balance the sides, but outside of those, world PvP is inherently unfair. Whether factions are imbalanced, or it's just a coward looking to trounce lowbies and run at the sight of an even-leveled player, world PvP is not fair. We've got battlegrounds and arenas if you want matched fights, and you can level almost exclusively in battlegrounds all the way to 90 if you want to, or dungeons for that matter.
The big issue here as I see it is that, and again Daxxarri's post above says it well, PvP realms weren't really proper PvP realms for many years, and now that they are again it's catching people off-guard. That doesn't change that they're working again as PvP realms. In most cases there's a solution to being ganked, whether it's calling on guildies or people from your faction, or escaping and hitting a different zone, BG, or dungeon for a while. We do have policies for very extreme cases when it crosses into ongoing harassment
, but even being camped for hours is something everyone should be prepared for.
As it's been a fact of how PvP servers have worked since launch, it's not too surprising that others will respond with recommendations against being on that type of server if you don't want to accept everything that comes with it.
I like me some BGs, but leveling on PvP servers is just too frustrating. I've tried it, I hate it, and that's ok. It's not going to be for everyone.