Alright I'll bite. If you're really being genuine here and truly not trolling, then please do yourself a favor. Try playing at least ONE of the legacy 3rd gen games you've written off as "mediocre" aka Witcher, FO3, and especially Fallout New Vegas (developed by Obsidian). But NOT Fallout 4 which is 4th gen and completely different single player FPS design btw.
Best yet, play FO3 and compare it to Fallout NV game play. And really, really try to play AND comple Fallout New Vegas on survival mode (hopefully this will be the PC version so you can add all the critical PC mod community bug fixes Bethesda wouldn't let Obsidian do when they forced them to release NV prematurely). Play the VANILLA version of New Vegas with ALL vanilla NV DLC. Commit yourself to an RP role. And it doesn't matter if you find yourself wanting to evolve/change your original RP PC. Just commit to the complex RP adventure you'll get from playing a NON LINEAR adventure. BEFORE trying to add any emergent game play mod content from the Nexusmods site.
Now if you can discipline yourself to play a 3rd gen game, with 3rd gen graphics (with or without having to install graphic overhauls like NMCs re-textures, Project Nevada, Vurt's Flora Overhaul, Nevada Skies Weather mod, or epic scope PC mod community DLC that add scores more hours in new world space game play the likes of New California) then please return after the 70+ or so hours from your vanilla play through. And honestly share your first play through experiences here.
That is the point where I'll seriously take any negative feedback on your part against the original Fallout franchise devs. Because without even having played a shallow Bethesda title, you have ZERO point of comparison for this or any game developed by Obsidian. Period. And regardless of whether you played a Fallout title or not, you would have noticed Obsidian belongs to an elite, shrinking minority of devs with high integrity in the industry to date. The other two devs that immediately come to mind are White Horse Studios (Mafia 2 and Kingdom Come Deliverance), and CDPR (Witcher and CP2077). NONE of these devs agree with adding cancerous micro transactions or loot boxes into the single player game. And ALL of these devs wanted to have a PUBLIC NON EXCLUSIVE release of their game. And NOT put their fan bases through the tomf*ckery BS that is Epic Games Store.
Finally, recognize that Obsidian is one of few dev studios left in the game industry to date who understand how to truly design a real RPG game. And how to implement CONSISTENT world building, franchise lore, creative story writing, PC and NPC development into every aspect of their games i.e. MQ, side quests, whatever sand box/free roam activities a player can do in the game world.