3d can age well also, Warcraft III still looks better than most modern games, it might not have dynamic lightning, shadows, etc but the overall impression is just stunning.

Warcraft III is such a great example of how make sure the 3D isn't working against you, both from gameplay and visual perspective. The camera angle is always fixed which means they can optimize the way characters look from that particular angle, not like sims 3d where you can zoom in and around and end up looking at an untextured ceiling. This also makes it much easier to design the gameplay such as selection and control of characters because there is only one scenario to cater for, instead of twisting the camera to select a character behind a building/mountain you simply design the game so that characters can't be hidden behind mountains. Other 3d RTS games from that era(probably today as well) made the mistake of thinking we haz 3d!!!1 now the player should be able to move around everywhere which just can only end with infinite bad camera angles instead of one good one.