Story was very vanilla for Dan Abnett, he's better than this. Character models and animation was massively dissapointing. Firewarrior on PS2 had better cut scenes. Altough I 'll admit that it's not easy to animate a guy in armor that must weight a ton, but who moves faster than a normal human (Initiative 4). But they did odd stuff, like having the thunderhawk drop them off so far away from the objective. It's not like the black legion had tons of anti aircraft guns. They could have taken a Rhino is all i'm saying. And they left the landspeeder behind! Tech heresy! Gaaaah!!
Besides, I'm not sure how everyone else imagines Space Marines to move, but I think it'd look comically wrong to have such huge troopers jump around like they're 16 year old ballerinas.
Well, I do know some novels have depicted Space Marines moving as little more than blurs, in some cases moving faster than Guardsmen could track with their naked eyes, and even occasionally deflecting bullets (I can recall at least one quote in which a Space Marine stopped a bolter round by deflecting it with his bare hand).
Also, while Bolters are armor-piercing they're armor piercing with regards to punching through stuff like Flak Armor. 3+ saves on Space Marines means as far as tabletop goes, even Heavy Bolters have trouble getting through Power Armor.