Pretty much all of the crit viral/slash/munition weapons do that without a riven. So I lost nothing.
It's a horde shooter, I actually enjoy the large quantities of enemies. And enemies are not as bullet spongy as I thought, plenty of weapons can take them out fairly easy. Besides use CC if you can't handle high amounts. Note: my prisma grinlok viral/slash (with a riven) pretty much 1-2 shots most of the enemies, so yeah, where were those bullet sponges again ?