you haven't lived til you've played Atari 2600 Space Invaders with a subwoofer cranked up!
"Demon Attack". Trust me on this one. One of the coolest things Activision (I think they wound up with the Imagic library) could do is an XBox version of that game with 5.1 sound. This needs to happen.
I want a portable just to use as a portable. I've got a 7800 for the living room.
I think the point we're trying to make is not that systems without pack-ins are weak, but how instantly you could get going with a 2600 or Intellivision. Once the hardware was hooked up, my little brother and I were playing Combat right away. No configuration (other than making sure the front switch was set to "color"), no reading the manual, no sitting through vanity cards. It took about ten seconds to explain the game to a new player. Simplicity is beautiful.
Not that there wasn't a certain charm in the 2600 coming with everything you needed - 2 sticks, paddles, two or three games. The only time a lot of people added hardware was the keypad that came with Star Raiders, although there were dozens of replacement joysticks available, so you could find the one that fit your hand best.
I finally sold it to buy a Colecovision. And though I missed my favorites (Superman, Raiders of the Lost Ark, Asteroids, Adventure, Air/Sea Battle, Outlaws [Boot Hill], and - believe it or not - Surround), I adjusted pretty quickly to the CV.
You never got the Atari adapter? I had a Colecovision and that adapter so I was in heaven playing the games from both systems