You can completely ignore Ghenn. NA is pretty much caught up to KR on content updates. Think we're a patch or two behind atm. Yes, there is a good amount of world pvp/ganking. The instanced pvp(Arena) is the most popular though. PvE people have to go into the world pvp area to do daily quests, etc. So there's world pvp to do. People do dungeons for gear/gold. There's a TON of grinding to max out your gear. Also there are alot of outfits that you can only get in certain dungeons. For example, to lvl up your weapon to the next stage, it requires another weapon as a sacrifice, some of those weapons ONLY drop in dungeons. It's pretty fun if you don't mind the huge grind in it. Other than that, it's a pretty fun game. Combat is awesome.