It's Doom 2, but not the way you know it
A trailer http://www.youtube.com/watch?v=d4pIHOzQtT4

Chain rocket launcher feels like a toy after you watch the nuke...

Meh, I can't get excited over an overpowered weapon mod.
I prefer Fruit Doom that a friend of mine made for Doom 1, too bad that was before the widespread use of the internet and thus it is lost forever.

Well, it is designed for wads like Sunder or Deus Vult, which are sort of overpowered level mods. This would look extremely silly in normal Doom levels.