I've played in every "open" beta so far. If anyone wants my opinions on it, just ask away. The combat system is WoW's hotbar system, improved. Projectiles have collision detection, weapon swings damage everything in their path, tons of abilities you have to aim. The level experience is more fun, particularly because you're never handed a "tasklist" of "go there and kill 10 boars". You're free to explore, and you are rewarded for it in exp. For example, you can earn a ton of exp by fully exploring any town or outdoors map, and on top of that you receive cash and an item for exploring it all. Plus, you never feel like you outlevel a zone, because you can complete a lvl1-15 zone and then go to another race's zone and complete theirs, and your level will downscale to the event at hand so you still feel challenged. However, at least in the beta, if you're planning to level two characters of the same race, you'll feel a bit bored because you'll encounter some repeated events. But that's when you go to WvW, which is my favourite part of the game.