Duke Nukem 3D was arguably the last great game in the line of 2.5D shooters that Wolfenstein 3D started and that came to an end with Quake in the middle of 1996. It's most remarkable feature is probably the level design because it got the most out of the limitations of a 2.5D engine and excelled in other areas like sound and interactivity of the environment. It has definitely not aged well visually but the fundamental fun of the gameplay still comes across. I'd say there's probably two reasons for picking up this game . One is nostalgia for those who played it back in 1996 and the other is curiosity for what was possible in a 2.5D shooter in the pre-Quake era of FPS games.