1) It's a good film, but it's not in the same league with the first two.

2) Michael probably wasn't directly getting any "street income" by that time because it would have been too dangerous to his "respectable" status. BUT: though Zasa was the head of the "olive oil business" and Michael had "sold the casinos," it's impossible to believe that he wasn't getting income from at least some sources that were white-collar illegal, or that he wasn't laundering some or most of his income. Why was he so hell-bent on getting International Immobiliare (apparently a European real estate conglomerate) if he wasn't intending to use it to launder money or for some other illegal or extra-legal purpose?

I infer from the Atlantic City scene that Michael was laundering the other Dons' money through his respectable fronts, which would account for his status in the Commission. "Just when I thought I was out, they pull me back in...." Yeah, sure, Michael: You were never out--you never wanted to be out.