Boasting one of the world's best forwards in Samuel Eto'o and a long World Cup pedigree, expectations were high that Cameroon could progress from a group featuring Netherlands, Japan and Denmark.
But this, their sixth World Cup, has turned out to be the worst ever for the 1990 quarter-finalists, who lost all three group games and were left rueing their terrible luck after failing to find a winning touch despite some spirited football.
"We are very, very disappointed. The team did play well but we didn't win," a visibly downcast midfielder Alexandre Song told reporters.
"We need to learn from this World Cup. We have talented young players who want to be in good form by the next World Cup," said Song, whose last-minute calf injury put him out of the Netherlands game.
Le Guen who joined as Cameroon coach in July 2009 managed to turn around the Indomitable Lions' stuttering World Cup campaign. But his squad featured an uneasy mix of young yet inexperienced talent and fading but influential veterans.
"Maybe I didn't succeed in unifying the team and bringing the team together.... perhaps I made mistakes in the squad of 23 I chose," Le Guen said, adding he would be leaving his post.
"I thought the team would be a good mix of experience and youth. I will not point fingers or accuse anyone," he added.
Midfielder Achille Emana openly questioned Le Guen's choices saying young players were being asked to do too much.
Captain Eto'o, three times Africa's footballer of the year, was also much less effective than normal after playing in a deeper role against Japan.
He had been criticised as having done nothing for his country ahead of the tournament by former international Roger Milla, who scored four goals during Cameroon's 1990 World Cup.
"A lot of things need changing," Stephane Mbia told Reuters after the Netherlands game, adding at times there had been a difficult atmosphere.
"I think we played very well but we had some very bad luck."
