TNT can wholeheartedly recommend:
Skyrim
Cold Waters
Armada 3
Starcraft II
Grim Dawn
Civilization series
Fallout 3 or 4
Company of Heroes 2 (great strategy game for WWII buffs)
Command and Conquer series
Curse of Monkey Island
Kings Bounty series (for turn based strategy)
Rise of Nations
X-Com