Let's be honest here, if you are looking for a great visual from Bethesda, you will not gonna have it. Their games are always weaker in the graphics side, visual-wise:

Arena (1994) + Daggerfall (1996) << Doom (1993)

Morrowind (2002) << GTA: Vice City (2002)

Oblivion (2006) + Fallout 3 (2008) + Skyrim (2011) << Mass Effect (2007) + GTA IV (2008)

Fallout 4 (2015) + Fallout 76 (2018) << The Witcher 3 (2015)

Personally, I don't care about graphics too much, but I do want them to fix the substantial bugs in their games (+better stories, but that's not an engine issue). No, I don't want their engine to be different but they must fix it because their games are always buggy at launch.