Recs.
Updated
SpecsUpdate
Pros
Pro Continuous content addition with seasonal events and "Living World" story arcs
There are many seasonal events that offer additional quests and rewards and change the look and feel of the areas effected (mostly hub areas). Living World content has a major impact on the game world, including an entire year long period where the main hub at Lion's Arch was destroyed as part of a Living World story and then rebuilt.
Pro Some 'enhanced features and stories' are available for purchase.
They have released two additional add-on products, each with new stories and worlds, Perhaps more importantly, they added gliders, and lately mounts, for enhancing the game experience everywhere, even in the classic world.
Pro "World vs World" large-scale PvP combat mode
Guild Wars 2 was one of the pioneers of the "World vs World" combat system, where three servers are given a group of maps to fight over for control and dominance, rewarding the victors over battles that rage on for several days. MMOs since have copied and enhanced this formula, but it's first big success was with Guild Wars 2.
Cons
Con Free but inconvenient to play
You can absolutely play up to level 80 and have lots of fun exploring the personal story and the open world. But there are a few things that are locked until you spend some money -- any amount of money -- on the game. The most annoying feature when on a free-to-play account is that you can only buy and sell a very limited number of things via the game's trading post. Having said that, in my opinion the value you get for the money you do spend is really high.