I can't quite think of the perfect game for your criteria so I'll toss out some other possibilities that might work.
Sherlock Holmes vs. Jack the Ripper
-It's first person with movement and camera control
-Has a dark theme which you appear to like
-Is not overly complex
-Doesn't generally have that "what am I supposed to be doing" feeling of Scratches
Still Life
-same as mentioned above except for the first person part. It is 3rd person fixed camera.
-Is generally considered one of the modern classics. Not super new with amazing graphics, but certainly decent looking enough to not be an issue....I think. I don't play on 60"
