GuildWars2 is everything that GW1, WOW and other mmos SHOULD have been
To be involved in this game - you have to be of a sand-box mindset. Yes there is a storyline series of quests and such. But the real live area events are awesome. They bring you into the game, make each area alive with living reactions. Also folks share experience for HELPING folks out that are nearby, that of itself is awesome (Rift and Defiance do this as well). I like this type of open public teamwork/cooperation.
Music and sound are great, the graphics are superb. Its Free To Play and very nice and enjoyable. A great quirky but effective "sell on AH while on road" option is great. The crafting system is pretty nifty as well.
Overall a deep and enriching MMORPG/f2p experience. If you are tired of WOW and the like - give GuildWars2 a try. It will draw you in for 40-100 hours and you will enjoy it (I never liked GW1 but GW2 is totally bigger, better, more fun!).
I hope as they add more content - folks hitting max-level will have more fun things to do (other than Helping Others, crafting and Leveling Alts).