In the best case scenario, you will wade through lasgun fire without it being able to damage you. That's one problem. The other is that the 40kRPGs impose something as the 'human norm' in terms of average stats for movement, carry weight etc. that makes the average guardsman statline seem like they're fighting from rusty wheelchairs. To even be on the basic capacity of a normally fit human being, you need to delve into space marine tier stats.
Anyway, OT, my main problem with ranged dodge is more one of crunch than of fluff. I have always seen it as someone being able to evade the line of fire before being shot, and not actually pulling a Neo and dodging bullets in flight. That's just ridiculous.
Speaking from experience with extremely lethal ranged combat systems, I have to say that low damage firearms can have their time and place. More so because in those games they're still deadly and have other advantages.