That's exactly the problem. It had nearly all of the ingredients to make a very competent motherboard but lost out greatly in the GPU department. Given the (lack of) performance provided by the Atom CPU, multimedia tasks are largely GPU dependent. It's great to see that Intel have modernised the Atom platform but it's all too clear that this is a platform for laptops and not desktops.
Yes, you can always drop a competent GPU into the NM10-DTX but at this pricepoint you shouldn't need to. The nVidia ION that we have tried multiple times can do HD up to 1080p without breaking much of a sweat and can even do CUDA accelerated tasks such as video encoding (with apps such as Badaboom). The nVidia ION2 for the new NM10/Atom D510 platform is even better still.
Sadly, all this review has proven is that the Atom is like a fish out of water when nVidia's ION GPU isn't present. The endgame is that similar money will buy you an ION equipped motherboard.