WoW was fun.. until you hit the end game and the game becomes "raid instance 40000 times to get good gear or no advancement." I like lord of the rings online, they plan to release armor sets/advancement opportunities to every type of playstyle including soloists. Not to mention I'm much more of a pvper (and although lord of the rings doesn't have much pvp I find the pve more entertaining. Can't wait for age of conan/warhammer/pirates of the burning sea). The pvp on WoW is terrible and horribly unbalanced. Not much skill involved either.
Pirates of the Burning sea seems like it's going to revolutionize how mmorpgs are done. A level 1 can effectively destroy a level 50 for example. The levels only determining the ammount of skills and what kind of boats you can captain. The bigger boats will move slower so a "lower level" in a quicker boat with further range can even defeat boats much bigger. The swordplay in the game is designed to be very realistic. No jumping around or running around like a monkey and techniques/attacks aimed to kill when they connect instantly do so make levels in pvp relatively unnecessary.
Air direction is going to play a large role in boat combat much like it did back in the day and they're aiming to make the boats behave as realisticly as possible. Then there's the fact that NOTHING will be gained from the npcs and all goods, including rum, will be made and sold by player traders. Endgame will consist of making money (via pirating, selling, or warring) and buying boats/building your empire. Really looking foreward to this game.
*Edit* Each level people will get skills/techniques and if I remember correctly just in swordplay alone each technique has about 80-160 different moves. You can only (by the highest level) have 20 techniques learned. Therefore many players will have completely different fighting styles (there's already 3 styles each with their own massive ammount of move sets) making it very unique. The strategy element in this game sounds nice. Four factions to pick from the French, Spanish and british as well as the pirate nations.