Under a Killing Moon, or UAKM as it's called, is groundbreaking game, not because it has the voice of James Earl Jones, or because Brian Keith and Margot Kidder make cameos, but because it was the first adventure game to properly implement full 3D examination and movement. "Oh no", you think "pixel hunting in THREE dimensions? Horrors!" It isn't though, the game implements it perfectly, and includes some very helpful and forward-thinking features like a complete history of all the facts you've discovered, complete dialogue history by character, items that can be examined in 3D, and even a built-in hints feature goes from very vague hints to explicit solutions, depending on how desperate you feel. To this day it remains one of the most "user-friendly" point-n-click adventure games around.
Bad points? It's a huge game, originally came on 6 CD-ROMS, due to all the FMV cutscenes and character interactions. The acting is certainly above-par for an FMV game, the only exception being Tex himself, played by the game's creator. While he gets much better in later installments, he's by no means a turn-off, just campy and cheesy to the max.
It's fun, with well written dialogue, and a 3D interactive world that in this era of Syberia and TLJ is still almost totally unique.