Originally posted by aldo_14
Going solely by reviews, no. There's something like 2 new monsters, one of which is a modified Imp. From what I've read, it's not a major change or improvement.
Off the top of my head:
*Old school Doom Lost Souls (flying, flaming skulls)
*Imp-like critters (faster and much smarter than imps)
*"TV head" (big nasty critter with... well a TV head)
*The Hunters (boss monsters with special powers)
*Various new zombies (hazmat suit zombies and zombies using flashlights comes to mind)
*Walking head critters
It uses also more of a variety of the Doom 3 monsters. While Doom 3 was pretty much an Imp/Zombie fest minus a few encounters, the expansion uses a much larger variety.
Overall, the AI while nothing astounding seems better. Some of the Doom 3 monsters like the MarsSec zombies and Imps were pretty bright. (using cover, not blowing themselves up with barrels, unlike the FarCry AI) The expansion's monsters are bright enough to change attack types when you use the grabber to steal their projectiles, they also dodge shots better.
Flipside, if your complaint about Doom 3 was (like mine) that it wasn't a real slaughterfest or a real horror type game you'll like the expansion. It's *much* more intense, since many encounters are designed that you need to use the artifact.