Doom was not the first person shooter again to offer death match capabilities. Death match, as would know, is a layout where multiple players get together and try to keep each other to score points. The winner who reaches the target the fastest or scores a specific number of kills is considered the hero amongst all other players. Death match is very popular primarily because it offers a more personal and interactive way of playing the video game.
Playing a first person shooter game and trying to beat the script laid down by the computer can be interesting but can lose its fun and charm after sometime. However, when you play death match and when you are picking yourself against live human opponents, you will enjoy a much better experience.
Increasing the difficulty level in the game is one option but the highest level can be way to beyond your capacity while the second highest level may be too easy for you. On the other hand, death match, simply put playing with human opponents over a network, offers the right mix of fun and excitement as you never know how good the opponent really is.
What made Doom really popular was that it could be played over a local area network by connecting Ethernet ports between different computers. There had been attempts in the past to create networked games by connecting computers with serial ports.
However, this was a very complicated affair and was very expensive as well. On the other hand, the ubiquitous LAN could be used to defeat players situated anywhere within the local area network.
This set of the trend of releasing not just the single player version but also the multiplier version where individual can challenge or opponents over a local network. It also lay down the track for online versions of the game where individuals would play the game over a broadband internet connection and challenge individuals situated halfway across the world.