If you're not a competitive player,
this game is not for you (unless you like to just stand around and roleplay and craft).
You're gonna hate exping here if there's assholes playing on your server because first person who tags the mob doesn't get the loot, it's the person who does the most damage. This game is made for competetiveness at heart, later on after lvl16 I think it was, you are sent to pvp, and the rest of the game dabbles in pvp and pve for questing and exping, later on quests die off, so it's not really a choice, it's more forced. PVE exp becomes grinding (like a merit party)

. Later on there's a zone called the Abyss, and that's the heart of the current game (think of it as Campaign, but other players instead of monsters for FFXIers, and Wintergrasp for WoWers), there'll be castles for guilds to capture, and you will have access to NPCs and Vendors specially for you, you can also earn abyss points and buy gear from pvping people, some of the best gear comes from this. If another faction has a castle, you can then fight their castle to take over it after a few hours have passed (it'll become open for attack).