I've got to strongly disagree with the part about keeping experienced players happy. First off, the decks. You don't have a whole lot of customization ability, and on top of that some (especially the Chandra deck) are pathetically weak compared to the others. The game play itself gets unwieldy when you try to time things like an experienced player would, ie regenerating your troll ascetic right before damage is dealt, or casting instants during your opponent's end phase because the stop time window during those times is narrow. Challenge mode was interesting, but like you said, very limited.
For an experienced player Magic Workstation is a better option for online play. It's free, has every card in the game, and phase progression is done manually, so you're never at odds with a timer. All of that being said, there's still one big incentive to buy Duel of the Planeswalkers and that's the Garruk Wildspeaker that you get along with it.
For an experienced player Magic Workstation is a better option for online play. It's free, has every card in the game, and phase progression is done manually, so you're never at odds with a timer. All of that being said, there's still one big incentive to buy Duel of the Planeswalkers and that's the Garruk Wildspeaker that you get along with it.