Sonic Adventure's Twinkle Park: Mirror Room Phantasy Star Online does this for "ceiling reflections" for Mines, VR Spaceship, and some others.
That's also how Duke 3D did it (only cloned the level architecture at runtime though, but that's why you had to leave a big area of empty space behind each "mirror" surface. "Taz: Wanted" made a puzzle out of it by having some extra items in the "reflection" and have the player find a way to cross over.
Mission Impossible on ps1 actually had mirrors reflecting with characters in the bathroom of the 2nd mission(the idea was that you were able to see the person who was attempting to assassinate you follow you into the bathroom). Oddly the original 64 version does not feature this and instead just has grey mirrors. Was really odd considering the ps1 had less power and previews for the 64 game mentioned that it would have reflective mirrors which didn't happen.
maybe they just couldnt get the code right or there were performance or processing issues that the ps1 didnt have? or maybe they just ran out of time to perfect this on the N64
Bully Scholarship Edition. There's actually a glitch that allows you to pass through walls and view the illusion in full force as on the opposite side of the wall is a direct copy image of the entire area solely for one mirror.
Luigi's Mansion for the great GameCube has got working mirrors.. Such a creepy, great game, I love it
The newer Silent Hill game for PSP maybe had you go through the mirrors to the other side. I'm sure they use a different technique than duplicating the bathroom like in SH2 and SH3.
I know that when I played Nascar Thunder 2003 on Gamecube it had a working rearview mirror for cockpit point of view. It was pretty realistic too.
Nobody said Shenmue yet? Remember that part in the Russiya China shop where the lady translates the backwards kanji letter?
I've been playing a lot of Euro Truck Simulator 2 (it's really good! Honest!) and that game actually requires you to pay attention to what's going on in your mirrors so you can make sure you're staying in your lane/not cutting off cars/etc. It's probably the best use of mirrors in a game I've ever seen, in terms of them being important to the game itself.
Someone said it already, but the Silent Hill games did this really well... Seem to remember a cool scene in RE2 where a licker comes through the mirror, too.
TL;DR the PS3 and 360 can't handle reflections with all the other junk they are pushing. (let alone full resolution Reflections) One of the few that did have them was Duke Nukem Forever and that's not the best looking game either.(And they were like half/quarter resolution reflections too) Full resolution reflections are pretty expensive these days. Go play Serious Sam HD and turn the reflections to max(full resolution) and walk towards one. Chances are your GPU usage will spike up even if you are having an easy time getting 60FPS with lower GPU usage. With the PS4, should start seeing Reflections pop up more these days i'd guess.
How do we know if a game has true reflections and not just some world on the other side perfectly copied? I remember many years ago a PlayStation car game by Taito (maybe published by Sammy) had what seemed to be real time reflections of the scenery on the car's windows. It wasn't the same texture repeating over and over again like many games do either. It did actually reflex what was going past you. Was this a real "mirror" effect or just some graphical trick? The game did have shitty graphics for even back then I remember.
People the world over debate this about real world mirrors and reflection, wondering if we are just reflections, and that what we perceive as reflections are really the (or one of an infinite number of) real world(s). Of course, the only people to debate this are either drunk or under eight years old. But people still believe in astrology too...