Interesting! The quests, outside of the opening tutorial, have not changed at all. It's possible you picked another faction (each faction has different quests - some factions are better than others). Visually, almost nothing has changed - only some lighting changes indoors from windows (in certain locations only).
That seems very odd. I absolutely did not feel this immersed the first time. The vast amount of bugs present back then might of course have had influence on that too.
It feels like a different game tbh.