Subjective.

Warcraft 3 for me.

I'll tell you as soon as you tell me what's the best car ever.

Emulated console games. /Serious

Bad rats. Obiously. Also, Dota 2.

Here is the list of my favourites: Mount&Blade series, Dota 2,The Elder Scrolls series(except online one),Gothic series(except ArcaniA),Two Worlds II,Witcher series,Hearthstone,Civilisation series,Age Of Mythology,Age of Empires series,Faster than Light,This War of Mine,Don't Starve.
Actually my most favourite was "Remanum" MMO but it has closed.

Heroes III, case closed

Skyrim.

Fortix

half life 3

Borderlands 2

Quake

Half-Life 2

Broforce

Mafia II

Portal 2.

Best eva? There isn't such, never will be.

Calc.exe

Pong

Minesweeper

Solitaire! Vegas scoring, draw three.

you at least have to divide it. genres or years, you should do both.

Medieval II: Total War

Grand Theft Auto V on Jan. 27th.