Don't get tooo hung up on the weight but some bloke on here just bought this year's Defy Composite 2... weighed in at 8.1kgs... I imagine the 3 is very similar as the spec is pretty much the same.
Giant might be an acquired taste, visualswise, but that particular model sat in my local Giant Store for about a year and a half and it's very pleasing in the flesh, not quite so straight a blue as in the pics, a bit more navy, and a sparkling metallic hue.
Oh it's carbon by the way, even to the seatpost!