The furious Light Blues boss admits the performances was unacceptable and couldn't give passmarks to anybody in his side.
Speaking to RangersTV after the game he said: "I'm angry, I'm disappointed and I'm frustrated because that's miles, miles short of what's acceptable.
"I won't accept it because that's as poor a performance as I've ever seen.
"I can't say where it comes from, I wish I could because I'd make sure it didn't happen again.
"We didn't pass the ball quickly enough, we didn't seem to have any confidence in the team at all.
"It was everything, absolutely everything and as you can tell I'm really angry."
McCoist is eager to address the issues and after speaking to his players he admits he'll watch the game again and put his squad through the same.
He added: "I'll watch the game again but there were numerous problems. Passing wasn't crisp enough and we weren't getting anything down the sides from either flank.
"We did not look comfortable with the ball and that is obviously a massive concern.
"Late it on it could have been worse, there's no doubt. We could have nicked it 2-1 with chances for Fran and Lee.
"As time was going on Berwick looked a little more likely to score and might have been unlucky to see one chalked off."