Now if I had the choice, yes the PC version of Doom is superior to this.  However!  When this came out back in the 90's, a lot of us didn't have PC's.  And if we did, they weren't "gaming PC's".  It's not like today where every PC has software installed upon purchase that can play most games.  Back in the day you had to install extra graphics cards & misc software to get games to run correctly.  It was just a lot easier for the rest of us to pick up the port.  And that we did!  While the graphics are pretty ugly by today's standards, this is still a very playable game.  And for those who can appreciate it, a TON of fun!  Also, for those of us with a larger SNES collection, that bright red cartridge is pretty badass :-P  You never have to look far for DOOM!