I think this is mostly an artefact of the editing. We get shown all the mistakes, and rarely the good ideas. For example, we weren't told who's idea it was to sell tickets to the pub grub last week, or who thought of the celebrity lookalike theme this week. There has been some creativity and I think it's mostly been from the women.
Shazia: looked very promising, if only she'd not abandoned her post in ep1.
Claire: very strong, everything she says is right, if only she wasn't so abrasive.
Sara: strong, one of the best project leaders so far.
Jenny: poor to middling. Did badly as project leader.
Helene: strong. Made one mistake as project leader in expecting too much of Lucinda, but otherwise seemed to get everything right.
Lucinda: still an unknown quantity. I like the way she's stuck up for herself.
Lindi: creative, but without good judgement. Needs someone to take her in hand.
Jennifer: strong, but she rarely makes the edit. I reckon a lot of the good ideas have been hers.
So Jenny is the only poor one so far.