In Ultima Underworld you can go toe to toe and hack at the enemy. In Doom, you use speed and straffing to your advantage in order to take out goons. This doesn't seem like a big deal, but it is quite important. You have the options to duck down and lean left or right.

Hell, it's hard to recognize its roots in Ultima Underworld. First, even though it came out a year after Doom, this is definitely not a Doom clone. Still, I made myself stick with it once I learned the interface better. I wanted to play an RPG, so I came very near to quitting this game and moving on to System Shock 2. I almost quit the game a few hours into play, not because it is not a good game, but because I quickly came to realize that it was mostly an action shooter, coming out a year after the famous corridor shooter Doom (1993). The reason I thought this going in was because some of the technology from Ultima Underworld 1 (1992) and Ultima Underworld 2 (1993) were used here, and System Shock 2 is considered an RPG by the community. I thought there were going to be more RPG elements than there were, even though System Shock 1 (published in 1994) is not considered an RPG in itself. So I thought I'd start one and share my impressions as I beat the game yesterday.

I haven't seen a System Shock 1 thread on here, which surprised me considering how much System Shock 2 is loved.

System shock 1 ending