Great UI Design?

I'm taking a class about game User Interfaces that got me wondering: is there a game out there that got the UI thing down perfectly? There's a myriad of excellent game UIs out there; I think Resident Evil 5 had a great Head-Up Display, though I found the revamped inventory lacking. MGS4's menus and HUD were both extremely well designed though they could be a bit crowded, and I always enjoyed the simplicity of the Silent Hill HUDs (or lack thereof) but is there a game out there that nailed the UI down perfectly?