Skyrim has a fairly dull and trite story, with a handful of notable exceptions. It was riding the fantasy zeitgeist at the time very hard, took few chances. (Again, with a few notable exceptions). The systems have been simplified almost out of existence. But if you want an open-world, free-roaming action-RPG for a zero-to-hero good time, it has the most polished *combat* mechanics by far of the five.
Skyrim was (in terms of mechanics) already outdated by the time it came out.
Don't get me wrong, it's fine if you play it as "baby's first rpg/rpg-light" but outside of that there's little to no reason to replay it other than if you've never played DLCs or whatever, which is why I've been playing it lately since I've got gifted the anniversary edition.
My experience has been that the DLC stuff is interesting setting-wise for an hour or two but then it just gets boring because of the inherent problem of Skyrim; Across the board dumbed down mechanics.
Skyrim is like a walk through a themepark where all the rides are different kinds of draugr themed merry go rounds & all the food stands offer only bandit flavored anything, where your meal gets interrupted by a guy in a dragon costume flipping your table for the "Immersive Experience ™".
The novelty wears off rather quickly if you've played any RPG worth a shit.
An all too common story is "I played Skyrim, then I played New Vegas, then I played other RPGs and then when I went back to Skyrim it was boring.".
The dumbing down of actual RPG mechanics is great for wide appeal, that's why you'll find the game to be a gateway for many women especially, I personally know loads who started with Skyrim and it's great for that.
But between dumbed down mechanics, needing loads of mods to be mechanically engaging, the slog of a main story, the tedium of the game's main selling point(dragons) & the lack of variety in dungeon crawls it's just really not all that.
Also, this goes for Oblivion too; fuck level scaling.