Mostly it doesn't fix with my depression since I usually feel too depressed to play games, but in terms of stress, I'd say it does. At least when I was growing up and dealing with problems with other kids, I could go home and deal with my stress by playing video games. Especially more violent games where I could be the guy making other people hurt, as opposed to real life when it was other people that was making sure I got hurt. As I managed to get out of that hole and the amount of stressed induced by other people have decreased, My once strictly-violent game collection has expanded into other games. Sure I still love being able to kill people, but I'm also happy and I also enjoy other games like more RPG-like games and, well, other games that can't really be considered violent (e.g. Heavy Rain).