London Broncos coach Tony Rea felt his side contributed to their own downfall in the 19-12 defeat at Catalan Dragons.
Rea's men turned in a much-improved display following their 44-6 defeat at home to Wigan last weekend, but they remain bottom of the Stobart Super League.
Rea said: "If you're marking us against last week's performance then, yes, it was an improvement.
"If you're marking us against what we're capable of, then that performance just isn't good enough.
"We're not happy and you could see out there that there was a number of opportunities that we threw away."
Rea bemoaned his side's lack of execution during a game in which they held a six-point lead following early tries from Tony Clubb and Scott Wheeldon.
He said: "There were a quite a few chances that we didn't take that we should have.
"We need to look at those and work out why we didn't take them and work out how to take them.
"We can do that as a group and that is the encouraging thing.
"I understand now why everyone is saying outside the club that there is so much belief in this team externally - the thing we need to change now is to get that belief internally."
Although victory propels the French outfit back to third in the table, boss Trent Robinson was again left fuming at a video referee decision that went against his side when Remi Casty was adjudged to have obstructed a Broncos defender after 19 minutes.
The Dragons had three tries ruled out last Friday in the 20-15 home defeat against St Helens.
He said: "We're clearly not getting the rub of the green right now.
"That was a try tonight - I've seen it five times now and it is a try. You just can't get those ones wrong.
"I'll get a report next week about it and I don't really know what else to say about it.
"All we want is for them to get it right.
"We've had quite a bit of talk with the RFL over the last week, but they need to do something about it.
"They need to express themselves to the public as well, it's not a feeling that decisions go against us, it is statistically weighted against us in the big games.
"We keep working with the RFL and we know that is not an open bias against the club but there has certainly been some poor decisions against us recently."
Robinson singled out Lopini Paea for special praise after the Tongan prop helped to provide the impetus for Jason Baitieri, Ben Fisher and Daryl Millard to score the match-winning tries.
He said: "I thought he was superb tonight, if I could have cloned him out there I would have.
"He took the ball in really hard for us."