Ultima Online + Shadowbane + FPS
Unique ground up game engine.
Open loot PVP.
Not level based, skill based (500-1000 skills)
8 years of development
Build cities, hire (and gear out) guards, hire NPC to vend your good, hire farmers to farm your regents.
Smart PVE AI (intelligent quake/doom type mobs)
Very in depth crafting system
8-12 hours to get across map (no zone lines, or zoning!)
10,000+ per server
Be a pirate, sail your ship and take other's over.
Similar faction system to UO as far as pvp flagging
Demolish opposing clans cities
Awesome FAQ here