Motta was sacked as Juve coach and replaced by Igor Tudor last week.
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He told Sky Italia's Gianluca di Marzio: "It's hard to do an analysis when you're so close. I am very disappointed because it did not go as we hoped.
"But I don't agree when people say it's a failure. Our collaboration stopped when we were one point from fourth place, which was the biggest goal from the start of the season. When I said yes, it was for a three-year project."
Motta emphasised that it did not go as hoped in neither the Champions League nor Coppa Italia, but that there were also positive signs.
"We did a lot of things well, but there were also several things I would have changed. Juve should have given me more time," he added.