Neil Harris was disappointed with Millwall's performance in Tuesday night's 4-3 defeat at the hands of Ipswich Town in the Sky Bet Championship.
Jed Wallace, Aiden O'Brien and Tom Elliott scored for The Lions in a ding-dong at The Den, but Joe Garner, Martyn Waghorn (2) and Jordan Spence secured a fourth straight win for The Tractor Boys.
The manager said: "The performance wasn't good enough. Not here at The Den. We had a go, we scored three goals - I could sit here and say the better team lost yet again, but you could also say Ipswich showed their class and ability with the football at key moments.
"In my opinion, we've given them four goals. We go 1-0 up in 45 seconds, but then we give a goal away straight after. We give the ball away cheaply in midfield for the second and third goals and we give a silly free-kick away for the fourth. Good teams like Ipswich will punish you."
Harris added that whilst there were many positives to take, characteristics usually on show were not present in the defeat.
"We should be winning that game tonight. I've said to the guys that there are a load of positives to take from the night - the goals we scored, the chances we've created, the second balls we picked up, the wide areas we got in to, overhead kicks, free-kicks, oohs and aahs, but that doesn't win you games of football.
"Organisation, discipline, work ethic, good play, good spirit and good decisions - that wins you games. Tonight, we were nowhere near them."