What do you mean by "What do people like, new or older ones still"? New or older games? Well, it depends on the person. Some of the most popular games currently are Counter Strike Global Offensive, Grand Theft Auto V, BattleField 4, BattleField Hardline, and your poison of the Call of Duty series.
Runescape, World of Warcraft, Dota 2, League of Legends, The Sims, and Grand Theft Auto, Quake, Doom, Age of Empires, Need for Speed, Call of Duty, BattleField, and Starcraft are some popular game series on PC.
Maybe Call of duty and GTA are good names to attract more sales. Every other person likes to play computer games unless they have a playstation or xbox ready.
World of Warcraft, Everquest, Starcraft, I've been playing Heroes of the Storm, as I'm a beta tester and that game is pretty amazing it will be available for play in June to the general public.
If we're talking about Nintendo Games...Mario Maker, Splatoon, Super Smash Bros. 4, Fantasy Life, Pokemon Omega Ruby/Alpha Sapphire, Mario Kart 8, Legend Of Zelda: Majoras Mask 3D and Ocarina of Time 3D, Super Mario 3D Land/World, Pokemon X/Y, the list goes on.
Also, Sims 4, RollerCoaster Tycoon 1 & 2, Command & Conquer: Tiberian Sun/Wars. (these are PC games).