I absolutely love Guild Wars 2 (& the developer ArenaNet). They just love their fans because you don't need to own the GW2 original to buy this expansion, the core GW2 game is included with this. Also there's no monthly fees. There's still a ton of players online, despite the game coming out in 2012. Gigantic world, great combat and graphics, just an all around fantastic game. Enjoy!
With so much to do in the game it can easily seem overwhelming to some new players who are used to theme-park hand-holding titles out there. But once you get into the story and find which game mode (if not all) you find more to your liking (PvE, WvW,SPvP) and a guild or multiple guilds to adventure with this game becomes a collector/achievement hounds dream.
Some people compare the map space in this release with the map space in other Guild Wars releases. It doesn't matter if it's not as 'much'. It IS an awesome amount for fun for the small cost. And there's no monthly fee. :)