I am a fan of TES and Skyrim in particular, so there will be no objectivity here. I’ll just say that if you somehow miraculously missed Skyrim, run and play, but take a vacation, because you’ll be out of your life for a good hundred hours. This is an excellent RPG, a cult RPG, an interesting RPG... In fact, you can praise Skyrim for a very long time, but if we talk about the main advantages (IMHO), then these are:
Replay value due to different builds. If you want, shoot with magic, if you want, slash the enemy with a two-handed blade, or if you want, be a secretive spy (classic).
Peace. The world in Skyrim is just something with something. You really want to go into every cave, every house that you accidentally encounter in the game, because there may be something interesting there and, most likely, there will be. Completely unique and very interesting.
Atmosphere. Snowy Skyrim, where somewhere behind the mountain you can hear the roar of... a Dragon? Hell yes, a huge lizard who serves another lizard who wants to destroy the world. Kill the dragon, take his soul, become stronger, because the greybeards shouted to you from High Hrothgar for a reason, Dovahkiin!