I think the real take away here is that DOOM is badass. I'll say it again. DOOM is that ass while being the opposite of good, in an awesome way.
The performance increases are a great marketing coup for both AMD and Doom. Gets them both in the news for positive, real improvements. And those improvements came while the game is still new (so new sales = more $)
Because then people say stuff like the above (and I assume you really mean it).
I haven't played Doom since... umm.... Doom 1. I'm pretty sure I played the shareware version.