Guild Wars takes the best elements of today's massively multiplayer online games and combines them with a new mission-based design that eliminates the tedium of those games. You can meet new friends in towns or outposts, form a party, and then go tackle a quest together. Your party always has its own unique copy of the quest map, so camping, kill-stealing, and long lines to complete quests are all things of the past. Within a quest you have unprecedented freedom and power to manipulate the world around you: your magic can build bridges and open up new pathways, or it can burn down forests and tear the ground asunder.
You don't have to spend countless hours on a leveling treadmill to get to the interesting parts of the game, because combat is designed to be strategically interesting and challenging right from the beginning. You don't have to spend hours running around the world to prepare for a quest, because Guild Wars allows you to instantly travel to the beginning of any quest that you've previously unlocked. You'll never spend days playing only to discover that choices you made early on have left you with a permanently uncompetitive character, because the unique skill system in Guild Wars allows infinite experimentation but doesn't allow bad decisions to ruin a character. And you'll never meet new players only to discover that you can't play with them or compete against them because their characters are on a different server than yours; in Guild Wars, all characters live in one seamless world.