I'd be interested in seeing where you heard this. As far as I understand, Che had indeed executed a lot of people, but that he took pleasure from it is propaganda stemming from the very vocal Cuban ex-pat community in the US. This claim seems to go against his character as evidenced by his own writings and from the testimonies from people who knew him or met him. Nelson Mandela famously said that he should be an example to every freedom-loving human.
/u/ainrialai gave a very thorough response to a similar question some years ago: