This game has always been RNG, period! It will likely always be RNG, Teir, Level, Etc makes no difference in that aspect. RNG rules this game, it is what makes it work the way it works (based on players in group).
As far as items, well, that's pure RNG, you might get a Teir 1 lvl 5 item with 200 durability or a Teir 2 level 1 with 200 durability or you might get either one with 500 durability (note, the durablility numbers are for reference only).
Sorry to burst your bubble,
Blaster
Edit: If you want to see how the RNG works start a solo game and play around in the creative menu to see what happens to gear/weapons.