2moons revolves around only two things
grinding and pvp/pk
if you dont' like to grind then you're in for a tough ride. It's very level based,so as good as you may be as far as pvp goes, you'll stil get owned by someone a few levels higher than you, unless they are a complete idiot.
so the gaming principles are pretty simple in that regard: don't like getting pk'd by someone who is 10 lvls higher than you? then work your ass off and grind to either catch up to them or pass them.
pvp/pk and grinding...it's a true mmorpg
because of the way the mechanics are setup in most cases, the only safe way to level and be safe is to join a guild with a lot of back.
Furthermore, advanced guilds can participate in things called Siege Battles where you can have 3 guilds participate at the same time. These are simple but loads of fun. One guild defends the castle and can even set up defenses and buy npc's to help defend and the other 2 guilds try and breach the castle and kill everyone in there.
These are scheduled of course.
Only guilds with the rank of 3 can participate in such events.
There will also be an arena once 2moons catches up to Dekaron.