Marm,
You know nids and marines are not on the same level. Maybe marines + knights or a supreme command of smash captains in something but that's not marines. Hive guard, flyrants, carnifexes and genestealers are better than anything in the marine dex outside of smash captains.
Better psychic, better psychic powers, better strats
So many units need points adjustments at this time wailing for 5 point guardsmen seems to be a waste of time. As long as triple dissie cannon ravagers are out there benefiting from doom all the things and shining spears/dark reapers are soul bursting entire armies to shreds 5 point guardsmen seem trivial...