The first episode is very sweet but because of a lack of a strafe key and the annoying way the Ai rarely misses, the later episodes become a matter of reloading a lot because sometimes one shot kills and they rarely miss! And considering they spot you the second you see them, it doesn't give much time to return fire. I can complete Doom on hard easily, but when you lose half your life with one shot in W3D, before you even got a chance to respond, it starts to piss you off
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Still, it's the daddy of Doom, which did it all much better. Wolf3D was really a maze game and the lack of a map didn't make things much better.