The stand-up comic appeared on the 2011 judging panel for the programme, alongside Amanda Holden, David Hasselhoff and, during the live shows, Simon Cowell. McIntyre quit the show after only one series.
Speaking to The Sunday Telegraph about his time on the ITV talent show, the comedian revealed that he became anxious about how the public were perceiving him.
"I was worried about that show, about changing people's perceptions of me, and about being in the hands of editors," he said.
"You know, you look at people like Cheryl Cole and you are like, 'This is going to put me on another level' - but it doesn't. Nobody came up to me and said, 'I loved it when you told someone they couldn't sing'. You only get to another level in my job if you are really funny and you keep coming up with better stuff than before."
He added: "You are just a cog in a big machine, and the agenda is not to make you look good. No. In fact, they will sacrifice you in a heartbeat for the sake of the show. And people put up with that, because it creates news. I just found it a little uncomfortable."
McIntyre and Hasselhoff were replaced on the panel in 2012 by Alesha Dixon and David Walliams.