Adam Saltsman @ Gamasutra: "As a game designer I think it's always good to go back and replay games that we remember fondly or that influenced us in some powerful way. Sometimes you find that it's aged poorly but still has some potency. Sometimes you find that you really had bad taste when you were younger. And every once in a while you find that it is far more compelling than you remember, and have this wonderful experience that you never expected, like a few weeks ago when I played Doom for the first time in a decade.
There are a few different reasons I wanted to go back and play Doom. First, this game had a pretty big influence on me. Not in that I got into satanism or marksmanship, but that Doom and its grandpappy Wolfenstein were my introduction to level design and game modifications. Many a geeky hour was spent sketching and building out entire campaigns with kickin' custom MIDI soundtracks (which, during any given week, would include tracks from the Peter Gunn TV show and the Spice Girls). I figured out ways to to lay out levels so that they felt like they were overlapping, even though they weren't."