I'm actually playing it on Xbox. Ultimate Doom and Doom 2 were included on the Doom 3 Resurrection of Evil disc.
Dos Box was giving me fits with my steam copy and I didn't really feel like playing a modified version.
Anyways finished episode 3 so I just have one more episode to go before I finish Ultimate Doom.
Inferno didn't really impress me to much it definitely feels like the weakest episode so far. Maps felt poorly designed making it really easy to get lost. Think the biggest problem was the majority of the maps involved a lot of back tracking and had a circular design. You could easily spend 30 minutes to an hour just looking for a single door
. The finale wasn't to impressive either the boss felt extremely cheap. You couldn't even see his projectiles and death was almost immediate if he caught you in the open. In the end I had to exploit his huge body and shoot him from behind cover as he tried to maneuver his way around the central building on the map.
Loved the extra bit after the end though
.