This isn't just about engines, it's the artwork created for them too. But since you mentioned it - how many games released in the last year have incorporated HDR lighting as fully and succesfully as Lost Coast and Day of Defeat Source? I can think of one - Splinter Cell 3 - and that was nowhere near the level of quality that the source engine can do. If anyone's thinking Far Cry, don't make me laugh, it's not in the game options and looks like ****. HDR has been around since 1997, and as yet there still isn't an ideal implementation of it in games. Source comes the closest so far, and is continually improving. To get back on point, I haven't seen any games that come even close to the quality and detail of artwork in Half Life 2, let alone Lost Coast. FEAR is impressive, but let down slightly by unimaginative and samey evironments. Doom 3 and Quake 4 are good examples of a powerful engine wasted on crappy low res artwork and models. I'll take "flat" textures and high poly models over shiny plasticky bump mapped ones any day. Prey and ET: Quake Wars look a little better though.