I would say that FC3 was much better on the story side and it felt more like that you were playing for yourself. FC4 has really nice world indeed, but there are also quite annoying bugs and glitches(You pick a flower and that causes you to fall through the world,etc.) and the story has been quite weak compared to FC3 and for me at least it feels like you are just rushing through when you are always told that what you need to do to save the Golden path and you need to do this because you are the son of Mohan Ghale. For me the FC3 was an exciting experience, but FC4 is more like a way to kill time and that's it.