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I think the only problem with it is that the controls are, well... EXTREMELY clunky at best. Fighting is about as fluid as Jell-O, and having no easy way to look around/strafe makes navigating far harder than it should be. I'm not saying it's bad, but, well... Control schemes have evolved a bit since the DOOM days. I'd love to see that implemented.
To look around, drag the left mouse button to orbit the camera or right mouse to rotate the character. Pressing <W> to go forward and steering with the right mouse button works like most 3D open world games and the <Q> and <E> keys can be used to strafe.
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Oh man... I'd played this so very long ago back when the only character texture was Mr. Knight Guy. I'd always wondered what it was still like... Well, now I know!