I'm more a fan of atmospheric black metal, 80's thrash and prog metal, myself but the psychological effects of listening to death metal have been researched. As previously discussed on Hacker News:

Dissecting the Bloodthirsty Bliss of Death Metal: https://news.ycombinator.com/item?id=18335308

Death metal music inspires joy not violence: https://news.ycombinator.com/item?id=19383699