From a programming point of view I think its impressive. I remember getting doom to run on my Amiga circa 1994 which was an achievement but it ran really slowly as was a CPU intensive game and the Amigas graphics chip-set was well past its sell by date and no good for 3D or planar type graphics.
Fast forward to 2010-11 and I got Doom running on an Amaiga Emulator flawlessly – even better than a 486 back in early nineties. The emulator gave the Amiga the power of an 060 processor running at > 100Mhz!
You don’t do these things to play these old games, its just because you want to see if you can 🙂
I now have Doom on my XBox 360 should I want to feel nostalgic; it usually last for about 5 minutes before I go and load a modern game….