Jade Dynasty would probably be my favorite out of the Perfect World series. If you've played any of their games though, then you basically know what to do as they follow the same outline with all their games it seems.
Classes in JD are known as "Factions". You start out as an Initiate then at level 15 you are able to choose between these factions:
Vim - Tanker/Melee fighter
Jadeon - Magic/Melee fighter
Lupin - Rogue/Assassin
Skysong - Priest/Healer/Magic
Modo - Transform/Magic
That's a little rough on explaining the classes of course. You can visit this link for more information:
As with all other Perfect World games, there is grind in this game. You will start to notice the grind relatively early (About level 20-22. Around those levels you run outta quests until level 30). This game does have a feature that PW's other games do not, and that would be the Meditation feature. Basically it's a skill all characters come with that enables you to gain EXP while being AFK. They also have the Invigorate feature which is essentially a "bot" which if setup correctly will allow you to grind while being AFK.
Overall if you don't mind grinding a bit, the game has great graphics as all of PW games do. The skills are all flashy just like all other PW games as well. I don't know what the max level is..I think it's about level 150 or so.