Dude, I know what an Intellivison is and how to play it because I own one. I have about 20 games and 2/3 of those games are complete in box. The problem with those inserts is that if you loose them (which happens often) the game becomes completely unplayable. To further reiterate my point, I have Burgertime on the Intellivision and Burgertime on the NES. Guess which one plays better? Guess which one is easier to figure out how to play if all you have is the cart? If you said Intellivision while someone held a gun to your head and demanded the correct answer you'd be brainless right now.
Please just stop trying to make the Intellivision sound better than it is, you're just shaming yourself. The Intellivison is an intresting footnote in VG history and nothing more.
EDIT: Furthermore, when you play most of these Intellivision game you end up using both hands on the "Thumb based NUmberpad" because not all the actions indicated on the insert card are not directional movements. So if you want to jump you might have to hit the 9 key. Half the time I play the games with one thumb poised over each half of the key pad. My dominate thumb usually taking the middle keys. I have to use 2 thumbs not one just to play that "d-pad".
