What exactly is Guild Wars?
To clarify the question, what differentiates Guild Wars from other games? What elements, either individually or combined, cause Guild Wars to stand out from every other game like it?
Some elements might include: No monthly fee, 8 skills, elite skills, PvP, frequent updates/balancing, lvl 20 cap, primary & secondary classes, etc.
Please refrain from turning this into any kind of GW vs. WoW crap, and also try to keep the flames and rants to a minimum.

. Prime examples being GWO clique dubbed as "Perfect Crystaline for Everyone Party"