The Elder Scrolls Daggerfall! Yea Daggerfall Unity is a thing and is pretty cool. But a full fledged remake would be awesome. Morrowind would be a close second.
The old GTA games are probably the sweet spot in terms of being pretty bad to play these days due to technical limitations while being so good otherwise they'd be worthwhile efforts to fully remake in a new engine similar to Oblivion.
Battle Realms great RTS game that fall short in the story since not all the factions were represented. Plus I can't find any other games like this where you can train one unit in different buildings in multiple tiers in order to become distinctly specialized on what it does