To be fair this guy's less than eloquent ravings are pretty much what this game gives you as a first impression.
How many games even have manuals these days? Not even one of the recent PC games I've played have required a manual, they introduce game concepts and even a complex UI in the form of an interactive tutorial. This is what gamers expect these days.
The UI and camera controls are pretty hard work, and very unorthodox. Even on the forums here in the past both have been lambasted.
Performance too can be very poor on high end systems. Shadows ARE terrible, smoke is quite basic.
Everyone here knows why these things are so and seeks to excuse them, but don't expect everyone else in the world to excuse them.