So from what I've read so far, on average, people don't really care for intermediary quality, and will mostly craft every 2 qualities at minimum, rendering q2 and q4 useless most of the time.
Alrighty, so this has also been my experience, as most of the damage comes from mod amount multiplier and perks, crafting mid qualities for Tier 3 tools is mostly useless, as they now have the same amount of slots. And as for Tier 2, so far I've only crafted a Q4 Pistol and a Q5 Magnum (pistol from looted q2 to crafted q4 and magnum from looted q4 to crafted q5).