And scrum-half O'Leary, who missed out on the Lions tour to South Africa last year with a broken ankle, believes the Ireland squad will take that frustration out on the All Blacks this month.
"Unfortunately, with Munster we didn't produce and I suppose Leinster the same," said O'Leary.
"Ulster and Connacht also had disappointing ends to the season and that's nagging away at all the players, but that's why you want to make it a successful tour - that's why everyone is mad keen.
"We're together for the first time since the Six Nations and we want to play well. When you have the opportunity to try and beat the All Blacks for the first time in your history it's going to create enthusiasm and there is a buzz around the camp.
"I've been up and down definitely - I know I've had good days and bad days this season.
"It's about trying to get a level of consistency, but it doesn't really matter how your own game goes once the team goes well."