Well if you enjoyed Skyrim and The Witcher a lot, you may actually prefer 2 over 1, and 1 is amazing to anyone who enjoys RPGs.
If you own Two Worlds 2, there's no reason to stop you having a laugh with it. Not necessarily to complete it or bother with any real questing/progression, but the magic system is more than worth a few hours of messing around with. If you're not convinced, look on Google for 'Two Worlds 2 magic' and watch some videos.
Divinity 2 is the most fun I've had this generation from an RPG, but it's quite low on production value, the voice acting is hit and miss and the animations in general are awful. The quests are pretty nice though and the story is fairly intriguing (awful cutscenes though!). You can morph into a dragon at any time.
There's around 100 hours in there if you're a completionist.
Mount & Blade is a great game, preferably look up Warband with the Floris mod. It's not a traditional RPG, it plays a little bit like a board game in how you travel, but it has quests and tons of factions. Floris improves the diplomacy tenfold and the battles themselves are awesome and the game features really good character levelling and progression with unique companions you can find and recruit. You can eventually create your own faction with multiple armies lead by people you've managed to either turn to your cause from other factions or personal friends you make in the beginning of the journey. It sounds weird but believe me there is a tasty RPG underneath the strange combination of genres.
There are others, but nothing sticks to my mind at the minute, sorry mate.
EDIT: Dark Souls, jesus how can I forget that. Amazing game, has the best combat and char progression you'll find to date. The graphics are the best in the genre besides The Witcher and you'll find it cheap on PC somewhere. You'll need DSfix though, but it's the simplest mod to install and use. You'll also pretty much need an xbox 360 controller for Windows, so if you haven't got that you may want to skip it. Totally worth picking up a used controller for though, or even brand new depending on how much money you've got to play with. I'd go more in depth about it but most of the fun about the game is it's mystery as you play through it.
EDIT EDIT: And Kingdoms of Amalur, it's like what Fable should have been, with added mature content. The combats great but it's a little easy and generic. There's a ton of content but none of it is memorable, it can even feel like a bit of an MMO-like grind at some points. If you still own a console, Dragon's Dogma is a great title, got it on PS+ recently and abysmal framerate issues aside, the games great. Very Shadow of the Collosus like, but with proper RPG elements. It's a Japanese game too, so it has awesome Jap voice overs and a strong Monster Hunter vibe.
Man this genres a little oversaturated coming to think of it, there are still tons others.
