Well to be honest I think gore makes a game a little more interesting I mean without blood a game would be just dull and unrealistic... Imagine playing a horror game without all the gore I mean the game wouldn't be as scary so gore also affects the theme of the game and also the feel to the game... I'm not saying that gore is neccesary I'm just saying that gore is just something extra that could make or break a game, sure there are good games that have little or no gore but is still very entertaining like RPGs, turn based strategy and real time strategy games (well some of them)