It's hard to say because RPG rely on more than one aspect to be good, there not like, say beat em ups or FPS which are very simple compared and only really need good gameplay.
RPGS on the other hand take up a lot of time and effort so they have to have in depth characters! (Your role playing at the end of the day) also the story has to be gripping and deep, these two IMO are the most important factors. But it's alright liking the characters and wanting to know what's going to happen next in the story! You still need to be entertained with the gameplay and battle system in between, and as you rightly say, the music has to be correct and beagle to give you that feeling of nostalgia when you go back to it years later.
PSN ID: Stokesy
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