Just played for 3 hours straight, and I'm really glad I bought this game. I'm having such fun with it
Highly recommend it to anyone that likes skill based shooters.
And I applaud ID for the excellent work they've done with IDTech 6. The amount of dynamic lights in this game is awesome, and the reflections are top notch for the high performance.
Also megatexture technology has come a long way since Rage, as the textures in Doom seem very detailed to me and texture pop in has been eradicated more or less. The only texture pop in I see, is when you load into the game for the first time, and that only lasts about two seconds. From that point on it's completely unnoticeable, at least on my machine.
It would be cool if they made a sequel to Rage with this updated engine, as the engine has fixed so many problems that affected the original years ago and tainted it's release.
That said,
GameGPU has put up their Doom technical report, and it matches what PCgameshardware.de's numbers more or less. Surprisingly, CPU optimization isn't bad at all considering it's using OpenGL. Regardless, I expect Vulkan to fix any CPU optimization problems the game might have, and will also likely help AMD
A LOT when ID releases the update.