As if I needed "reasons". But some of them sound hot to death. Observe:
1. Killing a dragon involves knocking the enormous thing out of the sky, with a combination of arrows, magic and whatever else you can think of. When you do, it crashes to earth like a meteorite, its huge body skidding along the ground in front of you with a sense of weight and speed that would kill anyone caught in it.
7. The world is so much more alive. You’ll see packs of wolves hunting mammoths, you’ll see fearsome beasts such as giants wander by without bothering you because they’re off on other business rather than being mindless killers, you’ll see friendly passers-by running up to you with a sword you dropped earlier and offering to return it – or taking a pop at you with it if they have some reason to despise you.
12. You can dual-wield weapons and spells. Or dual-wield spells. Or wield the same spell in each hand, and thus cast an ultra-spell.
17. There’s a real in-game economy. If, for any reason, you decide to destroy a local lumber mill, you’ll find it results in a shortage of wooden objects such as arrows in nearby shops. You probably shouldn’t destroy the lumber mill, then. Alternatively, you could chop some wood for the lumber mill, which will earn you a bit of cash.
^^ If this is pulled off properly and isn't just a gimmick, I might resign my citizenship and just sort of live in Skyrim instead.