If you have a strong PC and setup software emulation with modern emulators, and use CRT filters / shaders, then its not bad. It's pretty good nowadays. I mean its even good enough for Speedrunners as a replacement for real hardware. Most 3D emulation will never be perfect. We don't even reach perfect emulation for most 2D and older hardware. To me the biggest problem is the game controller setup. With the layout of the regular controllers, some games aren't as good to play (Mischief Makers / Yuke Yuke Troublemakers come to my mind).