I think you are in error here. Fashion is fashion and there is no way I can boost another royal woman's sartorial taste by posting a negative view of Catherine's.
And yes, it is negative. The gown itself is quite quirky and I think if she had paired the hair, as the model did, with either very short hair or a high updo, she would have looked quite stunning. However, as per usual, the detailed neckline was obscured by copious amounts of hair, as indeed were her somewhat odd choice of earrings. As previously mentioned, the faux see-through look is just plain odd and the skirt was too long, as it pooled on the ground.
Basically, the dress itself was a beautiful nod to Regency times. However, the beautifully detailed collar contrasting with stunning see though elements made it a very 'Naughties' gown and as such should have been drooled over on the model and left there!