Many say this is THE RPG game. They may be right. I am on my third playthrough. Why is it good? Simply everything seems like the right balance.
There is a lot of lore here. Just like so many of the Elder Scrolls series there will be a lot of books to read and people to talk to.
You must, in my opinion. use OpenMW a third party engine to play it. It improves the graphics and controls. It is basically a quality of life improvement.