I think the worst thing you can do is compare older games to new ones or newer series versions.
It's a bit like reading old stories or seeing older movies.
You can improve things with the right approach, but there is no escaping some form of comparison.
Mindset is everything, and nostalgia on it own is rarely enough. You could carefully prepare your mindset, by an approach involving a gradual return to that era. The entirely wrong thing to do, would be playing some latest greatest game and then attempting to enjoy a much older game immediately afterward.
How long you persevere can also be a factor, as it can take a while to get in the right head space.
I started my FPS gaming with Quake, all those years ago, having played nothing like it to that point.
After Quake I went back and tried to enjoy Doom and Wolf3D. I eventually had great success with Doom and played all the releases and many extra levels etc. Doom I could eventually say, that I really enjoyed. Not so with Wolf3D, as after a few levels I just got bored with the sameness and poorer graphics and controls. I can say I enjoyed some of Wolf3D and even appreciated it, but to this day I've never gotten into the right head space to complete the game. I still intend to try though, by attempting the right approach.