The 5th generation is my favorite generation period. Nowadays 3D games are more or less forced to follow a pre-designed template when it comes to controls, mechanics and even camera perspective. A lot of this standardization developed during the 7th generation, although there certainly still was a lot more experimentation then than now (I can’t imagine things like Gears of War, Crackdown, Infamous, Rock Band, Wii Sports, LittleBigPlanet, Portal and L.A. Noire being launched today as new AAA ips).
But the 5th generation had an almost unlimited amount of creative force, as there was no established consensus on how a 3D game should play. Hence we got stuff like Syphon Filter, Resident Evil, Metal Gear Solid, Tomb Raider, Crash Bandicoot, Super Mario 64, Ocarina of Time, NiGHTS Into Dreams, Panzer Dragoon, Tekken, Ape Escape, GoldenEye, Spyro, all finding their unique ways.