Skyrim is absolutely one of my all-time favorite games! I actually play is every few nights with my wife, even so many years after the release. It's her first time playing it, and we are having so much fun exploring stuff together and steadily leveling up. However, we've reached 100 in most of our main attributes now, so I guess we need to change our playstyle to get even further :P
Anyway, great post! I'm looking forward to seeing some other people comment here, and hopefully we get some different perspectives on what made Skyrim so great.