Guild Wars 2 provides a massive, online persistent world.
Free online play. No monthly fee.
Players have the freedom to play together even if their friends are at a much higher (or lower) level.
Players will be able to engage in organized, balanced PvP (similar to GvG in the original Guild Wars) without needing to first level up characters, find equipment, or unlock skills.
You will be able to advance your character to the maximum level without ever joining a group if you so desire.