I've been playing GuildWars for years now, and have loved the rich, detailed world and really well thought-out gameplay. I've been really longing for Guild Wars to be considered for a console like the PS3. That wish isn't coming true, but they did just release a wonderful trailer for the next rendition of the game, GuildWars 2.
GuildWars 2 Official Website
GuildWars Website...which you should check out the link for the free trial.
And by the way, GuildWars is NOT a pay-to-play like World of Warcraft. You buy the game, then online play is free.
Screenshot of a battle in GuildWars
More screenshots of GuildWars: Prophecies, Factions, Nightfall, and Eye of the North