The sounds are awesome. The guns sound powerful. Whacking with your fist or sword gives a very satisfying contact sound, even when hitting walls or railings. The ambient sounds and that of the Genestealers also sound awesome.
Although the Space Marines do not speak much, what little speech the game has, does sound very good.
The graphics are Warhammer 40,000 wonderful. Your fellow battle-brothers, the enemies, the space hulk interior, the details on weapons, the exploding sparks from your Power Fist when you pound a Genestealer into oblivion – everything in the game looks awesome.