Very worthy to play!!
Pros: char variety, lots of skills and upgrades, the titles we get become very useful in some situations, good graphics, many dungeons (I specially liked the idea of low level players being able to experience some hight level dungeons, like lake in dusk, and other two), hight drop rate, easy to evolve (if you do the quest, you never get bored, except when you must kill lots of mobs to obtain some quest items :P), battle mode is original, lots of wars XD, opportunity to create valuable items, and others...
Cons: combat system don't allow you to move while attacking, is like "just call your skills in the same place, without moving and waiting for the kill"(maybe is a little bit exaggerated :P); I don't see the purpose in having a guild (I'm lvl 50), the game could have a feature that increased the speed of the char along the levels. For example, in metin2 you need to evolve shoes or get items to add speed to control the speed decrease of the armour.Other thing I found very annoying is that if you run to a wall, for example, you cant slide, i.e you will be stuck, that influence a lot when cornering walls, if you beat the one inch, you must turn back to keep distance :S.
I think if we join them it could do a great game (they already are): cabal+metin2 = very good and addicting game.
I have just played this two. Not WoW, or any other (except runes of magic). Maybe I'm missing all the fun.