The Dane has signed Juve on-loan.
"I'd give Juve eight out of ten for their transfer strategy, as really top players were too expensive to buy. The Bianconeri got Kwadwo Asamoah and Mauricio Isla, who in terms of quality compared to cost are the bargains of the summer," former Chelsea boss Vialli said.
"At times Bendtner can seem like a phenomenon, as he has great self-belief and tries very difficult moves. In Italy he can make the most of his courage and physicality, but if he wants to stand out for his quality, then he's chosen the wrong League.
"I believe Antonio Conte will know how to use him best. Besides, even without a top player in attack, Juve can still win the Scudetto again.
"This will be a Champions League year for them to gain experience ahead of next season."