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Cunningham was particularly unhappy with Bruce's tactics, training techniques and the make-up of the squad which ultimately failed to avoid relegation to the Coca-Cola Championship.
Centre-half Cunningham, 34, has labelled Blues as "like a stiff corpse" with "no heartbeat" and "no soul".
The passionate defender has slammed the club for starting the season with only three strikers and criticised Bruce for tactical decisions and his recent revelations that two players - who he would not name - refused to play against Bolton on Sunday.
"I was very surprised when I read the articles, in particular the manager's comments," Cunningham said.
"They sounded a bit conflicting. On one hand he was saying that players didn't want to play for the football club and on the other he wasn't going to name them because he wanted to offer them some protection.
"By not naming the individual players he has, indirectly, put a big question mark over the integrity of every injured player, myself included, who didn't travel to Bolton."
He told the Birmingham Post: "A huge number of people, including the manager, agreed that man for man we were as talented as any team in the Premiership, apart from the top five and I think there is a lot of truth to it.
"Man for man we could hold our own against the likes of Blackburn, Bolton, and West Ham. If you agree with that statement then you have to find a reason why we finished up to 30 points behind those clubs.