I think a lot of people are missing the point that home gaming was entirely different 20 years ago. I'm only just about to turn 14, and I wasn't even born in the 80s, but from playing games like Ninja Gaiden on my Wii, I can tell it was all about the whole "arcade at home" deal. Arcades were the things that everyone was measuring home gaming by, because arcade games were the things that everyone had played back then. Somewhere in N64/PSX generation, it switched from being the "arcade at home" to more about being an individual experience.
3D gave games a lot more freedom, and most games didn't have to share the same concepts either now. Suddenly games could be like real life, or like a movie (as some crappy FMV games tried to do earlier). I think that the concept of 3D gaming has also changed over the years. I vaguely remember my 4th Christmas, and that year we got an N64 from my Grandparents. Over time we got games like Beetle Adventure Racing, and Perfect Dark. Now compare Perfect Dark with 3D FPSs of today like CoD 4. Control for both games is completely different. You essentially relied on auto targeting in most situations for PD, and in CoD 4 you barely have to (and you probably have zero auto targeting in the PC version). Why? Because of that second analog stick that was put into the game controllers with the last generation. Suddenly the game programmers didn't have to make a smart camera to follow you around. You were in control of the camera, and I think that was one of the reasons why the Dreamcast failed when it did. As an owner of a Dreamcast since late 1999/early 2000, I can say not having a second analog stick helped kill the Dreamcast. Once the PS2 came out, everyone realized how much a second analog stick could help with camera control.
Getting back my other game, Beetle Adventure Racing, let's compare it to a game like Burnout 3: Take down. I have & love both, but if you play Burnout 3 first, and then play BAR, BAR will feel limited and lacking. For instance: BAR has 6 huge racing tracks, and somewhere in between 10 and 15 cars. Burnout 3 on the other hand, has 18 huge racing tracks with 70 cars total to race with. Although BAR has a subtle arcade charm and lots of little fun secrets, Burnout 3 has that in-your-face charm & fun of crashing other cars into walls and such. For games like those, you just needed to have been there, or it isn't the same unless you try.
Other games you just forget how to play. I remember playing Duke Nukem 3D a lot when I was 3-6, and then just stopped until I was 11. I remember thinking, "Wow, I played this? How was I ever so awesome at it?" I used to be able to play Duke Nukem 3D blindfolded when I was 6, but 5 years later I had trouble just moving. Same with Perfect Dark. I Used to play it a lot when I was 6, and put it away for 5 years. I had lost the manual for it, so I had to figure out everything from scratch. Not that it didn't ruin the game, it just took me a lot longer to get used to it.
For those of you have have never played the original Bionic Command, you can play it here 100% legally: http://www.virtualnes.com/play/?id=NES-CM&s=9 . If you can play the game at their web site, that means they have the game at their offices. Which means they can host the game over the internet for millions to play. Although it's harder to play with just a keyboard, you can get an idea of how the game plays. For me, it's not a very hard concept to get around. It's just more annoying using a keyboard than the game itself.
I also think people are miss-interpreting the whole Hitler joke. I think it's more just "Wait, is he really saying that about Zelda and Mario?!?! What will he say next??"