Vanguard has had an interesting history, largely shrouded in a cloud of issues and controversy. Released back in 2007 (development started in 2002), the game was crippled by bugs and extremely high system requirements that would make even the beefiest of machines sweat.
The result of these and many other issues left Vanguard with an incredibly small, but dedicated player base. For those logging in today, the game is far more stable. I can easily crank up the settings to max, running at 2560x1600 (note: $1k build).