Of those 4 only movie download really appeals to me. But I'm already committed to buying the PS3 so I'm probably not the best person to assess whether these issues would attract someone away from the 360/Wii towards the PS3. You'd need to ask people who seriously considered buying a PS3, but went for one of the others instead. I'd say for most of those people it would be price and [exclusive] games that tip the scales away from PS3.
I don't really care about XMB, wallpapers, trophy rooms and such. As long as I can easily navigate to the things I want to do on my machine I'm happy. In game voice chat is necessary for certain games, but I don't see it as a system seller.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix
