Definitely! What is the $50 for? Is that how much they charge for the game in the USA? Over here it costs US$18 (just under GB£10) My eldest son just bought a copy this week to take back to Dubai. The game is massive. Take a look at its wikipedia entry here:
http://en.wikipedia.org/wiki/Guild_warsThe new expansion is
Nightfall - currently in beta testing, due for release October 27th. I play
Prophecies, and there is also
Factions. I think the majority of people are on
Prophecies.
It plays well - I have a high spec PC, but always skimp on the graphics cards (cheapskate at heart!) and I have no problems with the gameplay. And as you say - its free! Unlike
Stormreach, which is a fantastic game but at the back of my mind some of the enjoyment is leeched out of the experience when I think about how much it is costing me...