Speaking to the Press Association after the game, McDermott said: "We dominated the game and should have won.
"In the 87th minute Shane Long had a chance to win it with a header. In the first half we dominated but the goals aren't going in at the minute and in the Championship the first goal is very important.
"I have never been involved in a team that's had five successive draws, but on the positive side that means five games unbeaten.
"Shane had three or four opportunities early on and he has to make sure nothing gets in his head because he is not scoring.
"He's a striker and all strikers want to score. What would affect him is people getting on to him and that's not happening
"I have been here a year now and we were second from bottom when I took over. We have lost a lot of goals from the team with players leaving the club, but at the time I took over, none of our Academy youngsters were near the first team and now about half the team are from the Academy.
"I am frustrated for the players not for myself. We are trying to find a solution for our lack of goals and our substitutions were positive."