Purple gear is mostly shit because it's locked into at least 1 of the mods. So you need it to roll 3/3 stats and 1/2 mods to be useful.
Best way to get good gear is to check the vendors in Rift Town, Trench Town, Forest, and Bailey and Tiago every 30 mins. Find blues or greens with the 3 stats you want. If you want to really go hard, you can check on multiple characters. Hell, you can even get an alt to gear level 20 and gamble for the third stat when upgrading to 21.
You can also cheese the upgrade process; improve rarity to epic, quickly eye the 3 mods. If it's not a T2 you want, Alt+F4 immediately. If you wait too long you will end up with one auto-selected or a purple piece with no T2, so it's best if you know the mods by appearance. Best to do this from the Outrider camp; load in, wait for auto-save to stop spinning, talk to Zahedi, upgrade, Alt+F4 if you don't want any of the 3.