The drive of this article is interesting to me, because I am currently in the process of constructing decks, the sole purpose of which is teaching new players how to play Magic. What I am finding out is that in order to keep it simple enough that the new player is not constantly bombarded with new information, the decks have to contain some substandard cards. For example, Portal contained nothing but Creatures and Sorceries. I thought it was a good enough idea that in my 3-stage teaching process, the first stage does just that. (Second stage introduces instants; thirds stage introduces enchantments and creatures with instant-speed abilities.) Now, certainly, I don't think it's cool that WotC is selling packs of 80 pre-arranged, substandard cards for $12, but it's another thing entirely, I believe, if new players are loaned or given such stacks of cards by more experienced players.
Furthermore, don't dismiss the value of cards like Eager Cadet or Grizzly Bears. They serve a valuable function in teaching new players how to assess the value of cards, both in and out of the context of the deck they're in. For example, the green training deck I've built uses both Nature's Lore and Grizzly Bears. After my trainee's gotten the hang of the deck, I might offer her a stack of cards to substitute in, among which would be Elvish Warrior and Rampant Growth. It would be instructive for her to realize that in a mono-green deck, Nature's Lore is better than Rampant Growth (but that Rampant Growth would be appropriate in a multi-coloured deck) and that Elvish Warrior is better than Grizzly Bears, except that in a multi-coloured deck, it might be more difficult to cast.