Undying's fully articulated 3D characters and supernatural creatures are fantastic. The mansion itself takes on the aura of a living, breathing person with its flickering torches, ornate spiraling staircases, and windblown draperies. It seems to have assimilated an ominous, foreboding atmosphere that permeates your mind whenever you enter a newly discovered dark recess. There are some wonderfully spooky scenes involving mirrors and paintings (many of which were reproduced from Barker's originals). The Scrye spell, in particular, is marvelously inventive, as it allows the protagonist to witness events from the past.
.Undying is a lot of fun and is highly recommended for anyone who loves first-person shooters. Or if you love games with a spooky atmosphere but shy away from action games, set it on the easy level and enjoy the atmosphere. Either way, as a lot of reviewers seem to forget, it is still all about fun no matter what the genre.