Well, there is countering which is quite fun. You wait until he attacks and then pull him over your shoulder and into a wall and boot him in the stomach. There is the stealth technique where you stalk them in crouch mode and give em a good ol spine crush, or slit his neck
There is a Chuck Norris round house kick and you can run around doing that with the double punch, or you can do a leg sweep and kick em while he is crying on the ground. Or if you are more advanced than that (More advanced than me) you can jump of walls and 'death from above' or 'wall kick'. I will leave it at Lugaru so everyone else will get a chance to type their style in
ALSO, Sneak doesn't work behind overgrowth enemys!