His\/her role , however , is limited as merely a co-op player , and unlike some games , such as Gears of War and Halo 3 , Knight is not critical to the single player campaign 's story , as elaborated on the Eurogamer review . His\/her role , however , is limited as merely a co-op player , and unlike some games , such as Gears of War , Knight is not critical to the single player campaign 's story , as elaborated on the Eurogamer review .