So bad I don't know where to start. Fun if you imagine you're playing an FPS from 1999 with a sniper rifle.
I just want to make a few points:
After the huge anticlimax at the end of the single player story I was presented with a summary of my achievements. Accuracy, headshots, etc. The number that will interest you the most: Total play time: 4 hours 58 minutes.
And no, I did not just Rambo it. I played stealthily (which involved lots of quicksaves and loads because the AI is so crap).
So that just shows how short the story is.
Replayability: After finishing I made it my mission to get the longest range headshot possible. Then I discovered that over 599m, the range says -- like it does when you point at the sky.
EDIT: Actually this appears to vary between maps. Max I have seen on the rangefinder is 698m
Also, at ranges over 500m (exact distance not confirmed) headshots do not trigger the bullet cam.
EDIT: 570m headshot worked so seems to vary/depend on some unknown factor.
Hopefully a good company will come along and make a true successor to Sniper Elite.