Wigan boss Roberto Martinez felt his men did not do themselves justice as they crashed to a 3-1 defeat at West Ham in the Barclays Premier League.
The Irons recorded a first win since the end of September following goals from Valon Behrami, Victor Obinna and Scott Parker.
Robert Green saved a penalty from substitute Mauro Boselli and Tom Cleverly netted a consolation with a dipping drive on 85 minutes but it proved to be a miserable afternoon for Wigan.
"We conceded three very cheap goals for our standards, and that is something we will work on," he said. "We had a few players missing, but that is not an excuse. You got the feeling nothing was going our way.
"There was a good opportunity to get back into the game with the penalty, and then even at the end we got a good goal ruled out. It is quite clear to me the things we need to work on, but I was pleased with the reaction towards the end.
"It was a day of a real test of character, and that was there, but in football you cannot concede cheap goals, otherwise you are making things very difficult. We just weren't ourselves today, and that is where the work is going to be."