(Actual game time was 5.7 hours, rest was from my 2012 playthrough which didn't unlock most of the achievements for some stupid reason).
First of all, I must say I feel a bit cheated. The game runs natively in 640x480 resolution, but other than the title screen and one unused background mentioned in the commentary mode, all art is point resampled from 320x240. It shows and is such a pity, especially given that the background art used ingame is pre-rendered, so it should be a cinch to up-res it natively.
Also, the whole medium/psychic bashing was extremely heavy handed. I'm all for social commentary, but there's a fine line between this and irrational bashing and I feel this game crosses it at times. Yes, mediums are con artists. This does not mean they feast on child flesh, drink human blood for breakfast, etc, etc.
Speaking of crossing the line - Joey has been getting meaner and meaner with each game and some of his lines here are downright abusive. Not sure how to feel about that.
Other than that, another improvement from previous game. Really loved the implementation of commentary mode, and it actually had some good insights into development this time instead of n-th musing about how Dave Gilbert met this or that voice artist. Being able to use phone to look up clues was amazing, since you had to travel to PC apartment to do that in previous games, killing pacing in the process.
Some nice, simple puzzles - nothing akin to Donkey Cart puzzle in Discworld or Cat's Mustache from Gabriel Knight 3, everything was really logical. A few conversation puzzles as well, and few instances of needing to combine clues. Good hint system if you ever get stuck, although I still had to look some things online once or twice - though take it with a grain of salt, since I never was good with actual adventure game 'gameplay' - I play them mostly for story/conversations.
Personal 'not feeling ripped off' price point: $5
(For comparison, using the same metric for previous entries in the series would give you $2/$2/$4)