The lack of checkpoints was actually torturous! Especially that last mission. Every time I had to drive all the way to the starting checkpoint after ALMOST finishing was awful! I completely gave up several times, and didn't come back until days later. By the end I was beginning to believe I was a masochist. I had night terrors for weeks after that.The game was more serious than its predecessors being more violent than anything. I also notice missions were harder and that made it more easier to fail the missions then you're stuck doing the whole mission cause the game don't have checkpoints.