Assistant manager Paul Raynor was left less than impressed after another home defeat for promotion-chasing Rotherham as they went down 2-0 to struggling Barnet.
Jake Hyde got the show on the road for Barnet with a clever lob over advancing Millers goalkeeper Andy Warrington after 21 minutes, racing on to Mark Byrne's ball down the right flank.
And eight minutes from time Barnet completed the job, Ricky Holmes beating his marker wide on the left and squaring for substitute Andy Yiadom to sweep home an unmissable chance.
Raynor said: "We started brightly and their 'keeper made one or two good saves, but then it petered out. We certainly had enough possession, in fact we dominated possession, but we were very disappointed with the result and the performance. Three individual errors were to blame for the first goal, giving the guy an easy chance.
"But with all the possession we had we didn't really create any clear cut opportunities. For the second goal we were throwing men forward and were susceptible on the break, but it was another sloppy goal that could have been avoided and we need to cut those out.
"That's five we have conceded in the last two games and we need to cut those out because it's just not good enough."
Barnet boss Edgar Davids admitted that, beforehand, he would have been delighted with one point from his side's trip to Rotherham.
"I didn't expect it," he said. "But it went our way. Two very good goals as well but we have played better without getting the points, but we got the points. We had some good spells which I am happy about, but we have played better.
"If it had been 0-0 I would definitely have been delighted, but now I am even happier because we won.
"That's three wins in four but we still have to stay focused because every game for us is a final no matter who we play against because, at the end of the day, we are still close to the bottom of the league. Four of the bottom five have won so if they keep on winning we have to keep on winning."