Personally, I don't have a problem with violent video games. On the other hand, I will say, you're limiting your creativity if you only focus on violence. Heck, Portal was one of the greatest games of recent times, and it was not based on violence (well, okay, so there was violence directed at the player, but violence was not required to progress through the game). I mean basically, it's not that I think violence in games is bad, but don't feel like violence is a requirement, because then you'll ignore a whole spectrum of gameplay mechanics.