Sure the core gameplay is the same, but the camera work, control and presentation is all vastly improved. At least with MGS the gameplay hasn't been beat to death as it has with GTA. One GTA game was enough to kill that gameplay. Regardless, Saints Row which came out somewhere in the range of a year and half before GTA IV seemed to add more to the GTA formula than GTA IV did. Crackdown also created a much more compelling twist to the genre that far outshines GTA IV.