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.)
I have always been a fan of stealth games. Dishonored (especially the first) scratched the itch perfectly! It’s atmospheric. It’s not open world, but each level has its own area to explore that is filled to the brim with stories, sometimes a small side quest etc. I also love how you get to influence the ending.