The added scenes in the Director's Cut are welcome, and flesh out the story a little, but the new sections at the beginning of the game where you play as Nico feel a little padded with unnecessary puzzles to extend the playtime. Ironically, a few things that were in the original game are missing here, like some pieces of dialogue and an option that used to result in a death and game over. The Director's Cut has the same graphics, resolution and sound quality as the original, but newly recorded lines are of higher quality; which actually makes the rest of the sound much more jarring, as the old lines of dialogue are very low quality in comparison. The UI is slightly different too, and there is a hints system which gives you clues (and eventually a solution if you prod it enough) to the puzzles, allowing the player to set their own difficulty as they wish, so I find this a great addition. The most noticeable difference of the Director's Cut, apart from the new scenes, is the fact that little boxes appear on screen with characters faces during speech, which animates the dialogue a little more.
For those who aren't familiar with the game at all... Well, two things make a good adventure game: story and puzzles. On the story side, it's a globe-trotting kind of adventure about finding ancient clues, exploring ruins and mausoleums, uncovering murder plots, and a little bit of magic and mysticism. Although it sounds quite serious, it's actually a pretty vibrant and light-hearted game with some good humour and exaggerated characters. It's charming, but quite grounded and rarely laugh-out-loud funny. The story makes me think of a mix between Indiana Jones and The Da Vinci Code. On the puzzle side, it doesn't indulge too much in the typical "adventure game logic", puzzles usually make sense (with a few exceptions), and you don't have to roleplay MacGyver that much (again, with a few exceptions). So overall, great. Not every puzzle is entertaining though, and some are a little obtuse or long-winded. I love the music in this game too. Very atmospheric soundtrack, kind of minimalistic but soothing, and always fits well with the scene.
As a P&C adventure where you spend a lot of time just looking around a static screen and talking to people, visuals play a fairly important role. The art style was always good (for the most part anyway... Characters can look a bit "off"), but this game does look aged, and I'm not just talking about the resolution. Characters can clip through each other or through objects on the screen, some sprites are badly aliased; and when George is walking at an angle, his positioning and size relative to the environment around him can look embarrassingly bad.
Overall though, a great game that spawned a great sequel and... some other ones.