>>418793 That really depends on the game, and the team working on the game. For ex. Final Fantasy VI HD versions were extremely shit, but the recent C&C Remaster was stellar.
Having an option to toggle between legacy and HD graphics at a button press is also very useful in that regard. More and more companies realize that this is something that people actually want, since the reason games need a HD remake isn't because they want the graphics remade, it's just because they want some of the presentation to be improved: like widescreen support, higher fidelity audio, or simply the ability to run on a modern system.