Chances were few and far between at St Andrews but Teddy Sheringham pounced to convert one of ours to put us in front after 55 minutes.
But City, who created more, grabbed a deserved share of the spoils when Jeff Kenna drilled home his first Premiership goal for seven years.
Asked about the positives in the performance, Glenn said: "The fact that we only created two chances and scored one of them. You could turn that on it's head and say we were very clinical.
"Normally we'd create more chances. There was a lack of passing ability out there that we showed last week that we've certainly got.
"We set out to try and pass the ball and keep possession and it's brave to do that here because they do get at you, show a good spirit. But the conditions didn't help us."
Glenn Hoddle said the one positive from Saturday's draw against Birmingham was that we were clinical in front of goal.