I'd like to say TES, but Skyrim and Oblivion were boring as shit, so I'd say The Witcher.
Say thanks to Todd Howard, the guy who:
- Cut off the Dijlimeri ('the people that fly using their dongs') from Oblivion, because they couldn't make the Radiant AI work as intended, and they used to fly up in the sky, run out of stamina, then fall down to their death. Also, due to the 'cultural reasons'.
- Removed the 'alternative wastelands' from Fallout 3. Seriously, there was a guy who was crazy about alternative wastelands, and would drop you in the random location of the 'alternative wasteland' where you could explore a large map filled cool dialogues and witty jokes. Nazi Germany, US countryside in our 60-s, Russian wasteland, you name it. And all you really had to do is to find him some object in there, like a bottle of schnapps or a fresh steak.
- Removed slave trading from Fallout 3. Yes, you could make a raider fight for you, free of charge.
- Removed early plot drafts that were far more superior than the final one. You started as a child, and had to play your way into the adulthood - you could be easily molested, beaten up, or even killed on the way. Also, your father was kicked out of the Vault for different reasons - in the last version he had to find the new water chip, but then they sent you to find him, because he had a thing for chicks/booze/other things, and he could easily get off the trail.
- Removed the aging mechanic because QA department was dumb as fuck, and died before they could reach the final boss.
- More atrocious bullshit that even mods won't probably fix.