What a terribly vague question.
Are we talking political ideas? Ideological issues? Religious ideas? Spiritual ideas? Philosophical, existensialist or ethical ones?
Are we talking the human condition? What makes people laugh? Cry? Rage? Become calm and collected and clear? Beauty and ugliness both physical and metaphorical? Birth, life, death, rebirth; whether symbolic or physical?
Bioshock if you're looking for discussions of philosophical and ethical ideas.
Silent Hill for the human condition.
Call of Duty 4 gave me a distinctly anti-war vibe.
Minecraft CAN have a lot of shades of existentialism if you let it.