Good games are simply timeless in their approach. A good art style and direction trumps polygon count any day of the week and Chrono Trigger looks just as good today as it did over a decade ago. Akira Toriyama of DragonBall fame did the character design and art direction for Chrono Trigger and it translates perfectly into the setting and atmosphere. While at some points, the 16-bit beauty takes a light and whimsical approach to the RPG genre, the art style helps to make those moments fun and entertaining while still keeping the serious moments. Without rambling too much about why the art is important, I'll just say Chrono Trigger is presented with beautiful 16-bit graphics that haven't lost their luster over the years.
With RPG's, music is important because it is the main facilitator of mood and story. It requires someone that can understand timing and still be able to produce catchy songs. Nobuo Uematsu (who worked on many Final Fantasy titles) created a wonderful score and soundtrack given the limitations of the original hardware. The battle song is the song that you will hear most often and (for lack of a better word) it is awesome. If anyone plans on playing Chrono Trigger in public, wear headphones. There is no good reason why this game should be withheld from your ears.