Don't be so quick to slag off new technology.
Matrox have other things going for them except speed.
This benchmark is on a pre-release board with immature drivers, and beleive me on this technology where the graphics chip is more a huge array of programmable SIMD pipelines driver optimisation means a HUGE amount.
Wait for more and better reviews to appear - specially from places like CADENCE and other pro resources. Toms Hardware do good work (sometimes) but like all these toy review sites they just don't dig deep enough most of the time.
You cannot expect such a radically different architecture to perform top notch before its even available. Take Intels Itanic/Mkinley/ IA-64 chips. Their performance is dire compared to IA-32/x86 platforms, although it remains to be seen as to wether intel can pull a rabbit out of the hat on this front.