Quoted from HighProtein:It's fascinating how many newer sterns make the top 100 (32 of 100),
that all JJP games will be top 100 and that many boutique games will make top 100.
I believe it is mostly due to the combination of the modern display (DMD or LCD) and code, but a very small part is the newness factor which goes away at some point. The coder on newer games has the advantage of learned techniques from older games for making gameplay more interesting and diverse. Improved sounds/music and lighting are also big factors in my opinion.