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.)
Aaah, that game really left a hole in my heart that was never really filled again. Build crafting during school, playing in the evenings – those were the days. I also loved how the game forced team play much more than other MMORPG’s. And then there’s the lore, the beautiful zones… Truly pretty close to perfect!