Although, there are good and bad games for older and newer games, I honestly would say Older Nintendo Games were slightly better.
I like the older games because I grew up with them. The old Nintendo games are classics, which started most of the most popular Nintendo gaming franchises such as Mario, Legend of Zelda, Pokemon, etc. Those games were nostalgic, and were pretty good at providing great gaming experience. The music, the gameplay, and etc. just gives you this awesome feeling to your mind.
Although, the newer generation of games are pretty good, with new advanced technology to make better graphics, music, gameplay, etc.