Crash Bandicoot and super mario 64 were some of the best games I played during my childhood. I remember being absolutely blown away by the graphics at the time, and for those that owned N64, for some of the more "advanced" 3D games you had to insert a little expansion card to your console to power it up :P
Im sure the graphics seem dated now, but the gameplay was literally out of this world, and i feel back them more sweat and blood was put into the story and gameplay. Afterall, the graphics were pretty blocky looking back, and a lot of work went into "painting" the fantasy work into our minds.