Here's a Steam's Weekly Top Sellers May 26th 2014, it should be no surprise that Wolfenstein leads the pack:
1.Wolfenstein: The New Order
2.Transistor
3.DayZ
4.Watch Dogs
5.Arma III
6.Planetary Annihilation
7.Dark Souls: Prepare to Die Edition
8.Dark Souls II
9.Tropico 5
10.The Witcher: Assassins of Kings Enhanced Edition