Why? The length.
This is THE shortest game I have ever played.I got through it in less than nine hours,whereas the other Crysis games have usually taken me over two weeks to finish,at the same leisurely pace I just finished playing this one at.
The developers have seemingly spent all their money on the graphics and utilizing backstories/cutscenes like never before,but little on creating a good,solid and decent length of video game.What we have is style over substance.
If I had known this game was going to be this short,I would never have bought it.