Batman: Arkham City
1) if you are using the super strength option, then make sure to turn on the unlimited health option. in fact you might turn health option off and on a few times and THEN turn on the super strength option just before you are going to use it.
2) if you see that you are getting killed over and over instantly with super strength option, make sure to 'recapture' the batman base by turning off and back on a few times the unlimited health option. you don't have to have unlimited health on all the time to use the super strength option, but you might need to recapture the batman base by using the unlimited health option a few times, especially after cutscenes, between levels, etc.
i hope this helps,