I believe The Beatles: Rock Band came the closest to being perfect. Eveything about that game was just beautifully done and the only things missing was Pro Drums, an option for Keys, and a few more Beatle songs (Hey Jude, Strawberry Fields Forever, Yesterday etc. etc.)
Chrono Trigger: every aspect (graphics, gameplay, story, music, replayability…) has such level of polishness that it’s still outstanding almost 30 years later.
No other JRPG has come even close and, as a Final Fantasy fan, that’s hard to admit