We switched to the 'alternate weapon stats' and didn't look back.
The old stats felt wrong to us, with the crushing superiority of the ranged weapons over melee, and the unattractiveness of anything other than a HB or SB after you hit Distinguished renown.
But that was always the case. There is less chance of righteous fury from astartes bolt weapons (loyalist and traitor) which should make space marines more usable as allies or opponents.