This is what made me question that absolutely shit drop rate as you leveled. If you want to restrict the drop rate of max level legendaries, that's one thing, but to have it be so extremely rare while you level in a game that makes the gun obsolete within 4 levels, it sucked. You didn't value the legendary because the game forced you to grow out of it fairly quickly, so I think since the legendaries themselves had limited value as you leveled, they should have dropped more often as you leveled.
The exponential leveling of weapon damage sucked for this reason because they didn't take gun drop-rate into account. When I have to pop the golden chest open for decent weapons at my level because every other rare gun becomes obsolete in a couple levels, that's garbage.