Looking for RPG games recomendations.

How about old one? Enclave
Or new: Divinity Original Sin 1,2, Pillars of Eternity, Tyranny

No word if old ones are valid so they are in too :P
Baldur's gates and ice wind dales?
Final Fantasies?
Chrono trigger?
Vampire masquare bloolines?
Nier automata?
Fallout series(It doesn't start with 3 and new vegas)
Deus ex series(there are those older ones too)
Jos to name some quicly.

Kingdom Come: Deliverance, an RPG set in medieval Bohemia. (currently discounted on Humbe Store)

South Park The Stick Of Truth

Consider picking up a System Shock series - one of the best games I've ever played, though I played it (the first game) almost 20 years later since it has been released.
I'd also suggest you to try out Deus Ex series. I haven't played it yet, but I'm looking forward to :)
And KotOR.

Arcanum: Of Steamworks and Magic Obscura
The Temple of Elemental Evil
Krai Mira
UnderRail
Seven: The Days Long Gone
Atom RPG
Drakensang
Ember
Serpent in the Staglands
Masquerada: Songs and Shadows

This should cover most of the ones people tend to think too late of.

Late edit: Forgot to add Age of Decadence, damn.

you should also check this 5 days old thread : https://www.steamgifts.com/discussion/s6SHv/need-help-discovering-rpgs
;)

Wasteland 2
Planescape Torment
Torment: Tides of Numenera
Tyranny
Dungeon Rats
Age of Decadence
Titan Quest
Arcanum
Balrum
Victor Vran
Neo Scavenger
Inquisitor
Underrail
Lords of Xulima

Since Diablo is on your list I would recommend Titan Quest, The Incredible Adventures of Van Helsing and Sacred 1 & 2 (don't bother getting Sacred 3 - that one was a lazy and soulless cashgrab and sealed the fate of the series :( )

Sakura Dungeon + Patch ( ͡° ͜ʖ ͡°)

Skyrim
Idea Factory games (Neptunia series, Fairy Fencer)
Tales series
Final Fantasy series

You have played Shadow of Mordor, so obviously I recommend Shadow of War

And since you don't write PC games only, maybe you have Playstation, try Persona series

Ultima 7

I heard ELEX is in spirit of Gothic so you might like it. Personally I just started playing it.

Baldurs Gate 2, Fallout 1-2, Witcher 2-3, Deus Ex series, Vampire Masquarede Bloodlines, Arcanum, Tyranny.

Thank you guys for your recomendations. Also quick note.

I wasn't sure if Darksiders could be puted as RPG, but i played it. Most of games you also recomended are on my wishlist or on my account allready.

The games what got my attention.

Venetica.
Mars: War Logs.
Technomancer.
Grim Dawn.
Dragon's Dogma: Dark Arisen.
Divinity series.

A bit late to the party, but the following 3 were not mentioned above:
Nioh
The Elder Scrolls V: Skyrim
Warframe that is Free To Play, if you ignore the DLCs

Might and Magic series! :D
Best are VI - The Mandate of Heaven and VII - For blood and honor.

As for some more action oriented games with RPG Elements: How about Borderlands 2, Deus Ex (Human Revolution in particular), Dishonored or System Shock 2. I have also enjoyed the Trails in the Sky / Trails of Cold Steam games a lot.

Ascension to the Throne

If you liked Titan Quest, you should check out Grim Dawn, it's from the same devs.

Grim Dawn, Deph of Perils, Din Curse, Zombsite, Age of Decadence
Edit: Forgot to add Van Helsing series

Good, old Divine Divinity

This will turn into such a nice thread. Meanwhile, I'll make my contribution.

Ok, so for PC I'd recommend the first Deus Ex (although it's an oldie and you may find some compatibility issues), Dishonored 1 and 2, Dark Souls 1 to 3, Warcraft 3: The Frozen Throne (just for Rexxar's campaign, since it's like an RPG spin off), The Witcher 2 if you are into more linear RPGs, Torchlight since you are into Diablo games, and that's it.

Now, if you're willing to emulate some oldies from other consoles, you have the Pokemon games (from GB to 3DS), Golden Sun from 1 to 3 (GBA and NDS), and some Digimon games. Now, if you're confortable with emulating stuff or you have a Ps2, you should also try some Shin Megami Tensei games, like Persona 3 or 4. Devil Summoner 2 is also outstanding, it's seriously good.

And finally, this one deserves a special mention, since it's my favorite game ever: Final Fantasy VI. I can't put a number to the uncountable hours I played this game as a kid in ZSNES with my Pentium 1, always restarting it because I would get stuck. Well, I played it again a few years ago and finally finished it. It's such an awesome game, you get like 14 characters, all with different techniques to use however you want. It's full of secrets to explore, and the bosses are so funny. Also, the soundtrack was amazing. You should definitely give it a try if you like RPGs. Oh, and it's on steam too.

MyRPG Master
https://store.steampowered.com/app/329890/MyRPG_Master/

Bard's Tale IV: Barrows Deep
https://store.steampowered.com/app/566090/The_Bards_Tale_IV_Barrows_Deep/

Battle Brothers
https://store.steampowered.com/app/365360/Battle_Brothers/

7 Mages
https://store.steampowered.com/app/446590/7_Mages/

Dark Quest 2
https://store.steampowered.com/app/453690/Dark_Quest_2/

Deep Paths: Labyrinth Of Andokost
https://store.steampowered.com/app/375500/The_Deep_Paths_Labyrinth_Of_Andokost/

Dungeon Kingdom: Sign of the Moon
https://store.steampowered.com/app/329040/Dungeon_Kingdom_Sign_of_the_Moon/

Dungeon Rats
https://store.steampowered.com/app/531930/Dungeon_Rats/

Fall of the Dungeon Guardians - Enhanced Edition
https://store.steampowered.com/app/409450/The_Fall_of_the_Dungeon_Guardians__Enhanced_Edition/

Heroes of the Monkey Tavern
https://store.steampowered.com/app/492500/Heroes_of_the_Monkey_Tavern/

Heroes of Steel RPG
https://store.steampowered.com/app/291190/Heroes_of_Steel_RPG/

The Keep
https://store.steampowered.com/app/317370/The_Keep/

Low Magic Age
https://store.steampowered.com/app/576770/Low_Magic_Age/

Might & Magic X - Legacy
https://store.steampowered.com/app/238750/Might__Magic_X__Legacy/

Niffelheim
https://store.steampowered.com/app/351100/Niffelheim/

Pathfinder: Kingmaker
https://store.steampowered.com/app/640820/Pathfinder_Kingmaker/

Pillars of Eternity II: Deadfire
https://store.steampowered.com/app/560130/Pillars_of_Eternity_II_Deadfire/

Ruzar - The Life Stone
https://store.steampowered.com/app/366510/Ruzar__The_Life_Stone/

Stoneshard: Prologue (Free)
https://store.steampowered.com/app/869760/Stoneshard_Prologue/

The Quest
https://store.steampowered.com/app/428880/The_Quest/

Warbanners
https://store.steampowered.com/app/650440/Warbanners/

Wolcen: Lords of Mayhem
https://store.steampowered.com/app/424370/Wolcen_Lords_of_Mayhem/

Realms Beyond: Ashes of the Fallen
https://store.steampowered.com/app/762550/Realms_Beyond_Ashes_of_the_Fallen/

VALHALL
https://store.steampowered.com/app/908740/VALHALL/

Druidstone: The Secret of the Menhir Forest
https://store.steampowered.com/app/954650/Druidstone_The_Secret_of_the_Menhir_Forest/
http://druidstone-game.com/