Perfect Dark
It helps that 4J Studios has seen fit to acquire and implement higher-resolution textures and character models than what could be afforded a decade ago. I wish they had done something about the sound quality, too. But regardless - this game is still good. I flailed around for a while because the controls are a bit different, but a couple missions later it all started coming back to me, and I felt just like I was holding an N64 controller (aside from, you know, the retarded shape of it).
The biggest failing of PD for XBLA, and this is a big one, is that there is an auto-aim setting, which is
1) on by default,
2) hideously effective, and
3) valid in online multiplayer.
Time was, if your opponents had auto-aim on, you could reach over a few feet and smack 'em upside the head. But with the advent of The Internet, this is significantly harder.
So, until/unless someone fixes this, random online multiplayer can't really be taken seriously. But it still does split-screen, and you can do private games with your Xbox Live buddies - not to mention keep a steady framerate - so overall it's a better experience than the original was. Hell, in many ways, it's better than modern shooter games. Three words: Laptop sentry gun.
Progress: Chicago streets - worst mission ever!