I'm level 37 and I've only had one orange too. I guess they're rare for a reason
Did bunker last night. Killed the big floaty thing on the rooftop. Showered with more loot than I've ever seen. A couple of rubbish greens and the rest white.
Did the bunker and afterwards opened the Mordecai chests... all pistols. Then, after AGES of staring at the chest behind the bars in Sanctuary, finally get into it and... pistols.
I'm not a lucky vault hunter, only one orange so far and I'm level 24.