I don't think much of the "defining game" thing. Many of them feel like they're just thrown in as a big game at the time - Diablo 2 is an amazing game, and was

I don't think much of the "defining game" thing. Many of them feel like they're just thrown in as a big game at the time - Diablo 2 is an amazing game, and was very popular, but it wasn't fully 3D and the resolution was so limited I don't think there was usually a need to buy a new video card to play it (in fact I think it might have been just fine in software most of the time).