I've never been one for MMO's I enjoyed LOTRO a bit but I suppose this is worth a shot.
Neither am I. Guild Wars was my favorite MMO, Guild Wars 2 completely blows it and other MMOs, if not, any game out of the water. It is open world, you have freedom. You can go anywhere, even the high level areas as a level 1! Dynamic solo and group quests and the like. As a matter of fact, the world is so big that I only see a real person every 10-15 minuets unless you are near a big town like Lion's Arch. Trust me, you will love Guild Wars 2.
And to touch up on the freedom you have, there is no "energy"magic" thing for attacks, just click to attack and use skills as combos. Underwater gameplay is beautiful. Best part? You automatically get a re breather which lets you swim as long as you want without needing air. You would be amazed at the details and freedom this game has.