I have played both the PC and SNES versions of the game. The SNES version lacked ceiling and wall textures and was a fair more difficult to play using a controller. But as rough as it was it was my introduction to FPS. I can't remember if I completed that version, but I did complete the PC version of the game. Well, the standard version at least. Not Final Doom.
I bought the Steam Quakecon pack a while ago which included all the id and Bethesda games on Steam, so I have all the Doom games. I've only played the first one, but I haven't beated it yet :/