If you love PvP this game is for you.
But it has to be made clear that even though you can't kill anybody, people can still kill you.
My opinion, that is totally ridiculous. Of course, if you do get attacked you then have to mess around changing your PK mode before you can fight back. Another element that illustrates the PK desire is the way that the game saves all your setting except your PK mode. Every time you load up the game you start in Capture mode.
I must also point out that classes are not very balanced. Many would argue that an archer is amazingly overpowered and Taoists that "Guard whore" are also much more powerful.
Of course, if you enjoy PvP this is a great game. The fact that no one is safe is an interesting prospect from the PvP point of view. You also don't need to worry about being at a lower level than most players because of the power levelling feature. If you are within range of a team member you will gain all the exp from the monster they defeat and they receive all the exp too (It's not shared out, both players actually get the full amount). This is particularly helpful when trying to gain levels fast.
Of course, once you have some levels under your belt it's now time to work on levelling your spells and weapon skills. This makes the game even more interesting as a characters level, or Potency, is not all that counts.
Potency is the way the game calculates power. It is a total of your level, equipment bonuses, rebirths ect. This is usually more important than the characters level when determining who the winner would be.
So now you're thinking, what's rebirths? Well, unlike other ORPG's once you reach a certain level, you can get reborn. This means you go back to level 1 but also gain new skills such as the Guard. It's not all bad as thanks to the Guard you kill high level monsters easy and you become even powerfuller with your second rebirth. On the second (Final) rebirth you also gain the ability to store lucky time but even without it you can stand next to someone who is 'praying' to store lucky time even at level 1!
Lucky time basically randomly lets you become immune to hits and deal double damage.
When you do get reborn you can also reselect your class which opens up a wide variety of options for your character.
If there is one thing you will never forget about this game it's the jump. In one word: Broken. Once mastered, which takes all of 10 minutes, you can simply jump over enemies and hit them with your ranged attacks. This lets you take on high level enemies without any worried of taking substantial damage. It may take longer to kill the enemy but at least you're still alive and benefiting from the exp of a high level foe.
The quests are also replayable which ,as i'm sure many would agree, seems odd. Not only are they replayable but you get the full reward again. Furthermore, some of the quests that many new players would do first because of the position of their start point, are actually quite hard for a new player. Also, many new players will find themselves sort of restricted to one area. It certainly is worth finding someone to power level you fast to get into this game quickly. Normally finding someone isn't too hard as they also gain rewards for doing the honour of helping newbies.
There is a lot more to do in this game such as making a house and getting married which in turn give their own benefits and rewards.
If you are planning to play this make sure you know what server your friends are on as you cannot swap servers.
You have to remember this game is totally free unless you want to buy the Dragon Balls which you can actually buy in game of other people anyway. When you consider the fact that this game is free you have to appreciate the things you get which are very good. If you don't like PvP however, stay well clear of this game.