The original Colossal-Cave featureless protagonist. People writing menu-dialogue games, take note. A single scene, late in the game, shows you from third-person perspective. Must be a bit of a jolt for female players. Plot control is a little obtrusive at times.
Characters go on convenient errands, leaving thing unattended at just the right time.
The interface is quite nice. It's a standard first-person view, but it uses arrow keys for movement, instead of loading everything into the mouse. People blindly imitating the Myst pure-mouse interface, take note. However, a few seem badly out of balance. In one case, I had to push someone through a particular dialogue sequence, in a fairly bushy menu tree, before I asked a favor of him.