I think this game is an improvement on the previous two. It was more orientated towards puzzles than pixel hunts (as opposed to the previous game where the only challenge is the pixel hunt), but the puzzles could still have been more challenging. As with the previous 2 games, you get a score at the end which is just a number - achievements would have been more welcome.
The things you're introduced to, despite still being outlandish, are presented in a slightly more subtle way than a vampire in your face. I'm liking how the story is starting to unfold - and that is really the selling point to this series. It's very imaginative, and despite my criticism for the lack of subtlety in the previous game, it's also refreshing to see a game not shy about revealing its mysteries.
One final wish would have been more of the storyline to be revealed through the game in a way other than reading the text off a computer screen and the odd datapad, but if the alternative would have been to leave these things out entirely then this is of course better.
The first game could maybe be compared to the first Matrix film, if you think it was something that was completely different and got people excited about the sequel. Then when the 2nd came out, it had more explosions and was "bigger" (and had vampires) but that didn't make it a better film - as with the 2nd game. Thankfully though, the 3rd effort in this series is not like the utter disappointment of Matrix 3.
So all in all an improvement that makes the game and the series worthy of the author who has created other popular games. I'm glad the next game is just a click away, and I won't delay for long!