Derby manager Nigel Clough launched a scathing attack on his side after they were thrashed 5-2 at local rivals Nottingham Forest.
Luke Chambers' early opener was cancelled out by Luke Moore but Marcus Tudgay struck twice before half-time to give Forest a commanding 3-1 advantage.
Robert Earnshaw piled more misery on Derby after the interval before former Forest man Kris Commons quickly reduced their arrears.
The Rams could not find a way back into the game though as they went down to a fifth successive defeat, which was made more emphatic just before the final whistle by a second Earnshaw goal.
The result also meant that Forest had gone through the whole of 2010 unbeaten at the City Ground.
Clough, who had a lengthy career as a player at Forest, was more concerned with the performance of his own troops and questioned whether they have what it takes to be successful.
"They can't really hide. When you go over the white line, there's no hiding there, you either do it or you don't do it," he said. "Some can do it, some can't.
"We get to the stage where we give the players every opportunity but at some point you have to move on to the next group.
"All the ability in the world isn't enough at this level. You have to have the desire.
"You've either got it or you go back to League Two or Poland or wherever you're from. We can't afford to have nights like this."
Clough singled out Dean Leacock and Paul Green for particular criticism.
"Dean Leacock for an experienced defender with Premier League experience and an international midfielder in Paul Green, I thought they offered us absolutely nothing," he fumed.
"You talk about the inexperience of our young lads, you're looking for those sorts of players to show a little bit but they gave them absolutely nothing.
"We have got a very young squad, you need those so-called experienced players to come through for you.
"We thought we were a little bit further down the road. This is a major setback and it's the most upset after I've been after a game of football."
Forest manager Billy Davies, meanwhile, hailed his side's 'remarkable' run of 30 home games without a defeat.
"I think the most important thing is the outstanding achievement of 30 games undefeated," he said.
"It is absolutely remarkable and great credit has to be given to everyone at this club.
"I think it's a very good three points, we should have scored more goals. It was an excellent team performance and a thoroughly deserved three points."