While nothing like the Original, Doom II introduces lots of new characters to splatter across the floor.
MULTIPLAYER:
Originally, Doom II had multiplayer features like the original, Modem, Serial, an IPX. Currently, a Doom port called Skulltag however has taken over the multiplayer world of Doom.
MODDING:
Doom II, like Doom, is extremely editable. With the right programs, creating new maps, replacing old sounds, sprites and music, can all be done quite easily. In fact with ports like ZDoom, the option of actually adding new enemies and weapons is all possible!
FINAL WORD:
Doom II brings you and all new set of chacters to splatter across the floors, and new maps and weapons to do it with. In all thoug, Doom II just doesn't seem t make it as the orginal did.