Looking back it seems the older games had a lot to offer that has for the most part been lost to time. Things like 8-bit music, limited saves, and a few other things I'm probably too tired to think of.
If I had to pick one thing though it would be how when a game was released it had to be a complete game due to the lack of an online service to provide patches. When you bought a game you knew it had been tested to make sure there were fewer if any bugs and you didn't have to spend time afterwards updating it (in some cases several times per week). Imagine that nowadays, if a game like Rome 2 Total War was released when it was done, not in advance only to need many patches later. If Dead Rising 3 didn't need a massive patch not long after launch. Sure it pushes back the release but it saves the consumer time.
What things from the past would you bring into the modern world?
If I had to pick one thing though it would be how when a game was released it had to be a complete game due to the lack of an online service to provide patches. When you bought a game you knew it had been tested to make sure there were fewer if any bugs and you didn't have to spend time afterwards updating it (in some cases several times per week). Imagine that nowadays, if a game like Rome 2 Total War was released when it was done, not in advance only to need many patches later. If Dead Rising 3 didn't need a massive patch not long after launch. Sure it pushes back the release but it saves the consumer time.
What things from the past would you bring into the modern world?