I'm just going to copy/paste what I wrote in the news section:
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There are ways to make this a good thing.
1. Make sure that, as this article states, it doesn't happen automatically when you stop playing.
2. Don't give the player any points or recognition (money, titles, anything the particular game holds of value) when they use this feature.
3. Have some kind of incentive (like extra points, items, or levels) for players to beat the whole game by themselves.
4. Allow the player to go back and redo the parts that the computer did for them.
I mean, this has plenty of benefits.
A) In a Mario-ish game, the challenge isn't in knowing what to do, but in having the reflexes to do it yourself. If someone uses it to see what they need to do, then they can try to do it themselves.
B) In NSMBWii in particular, if a single player needs a bathroom/drink break, they can turn this on, and keep up with the other players while they're away.
Another thing is, this obviously won't do anything other than completing the basic section of the game. It won't find secrets, take hidden passageways, find faster ways of doing stuff, etc.
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This also allows them to make much more difficult gameplay for us core gamers without alienating a newcomer.
