Irving has one of the nastiest crossovers in the league. I would put it right below Westbrook's and Curry's.
He's definitely not overrated, has one of the better offensive games in the league.
"Offensive game" goes beyond scoring. For instance, Curry is exceptional at getting his teammates involved so even if his shot isn't falling, he's still contributing on the offensive end. There are other players, like Westbrook, who is a great rebounder. Or others, like Wade, who are excellent defenders.
These players all help in ways other than scoring. But Kyrie? He's worthless when his shot isn't falling. Saying he has one of the better offensive games is ignoring everything related to offense outside of scoring.