Although it's been stated that everyone in the current pvp mode is on equal footing, I guess some still don't believe that. I'm level 8 and have been killed by level 5, all white weapons/gear.
Personally I'm not that good at FPS PVP in general, so I'll admit that some people are just flat out going to dominate/kill in PVP. I'll get better over time, but there are just some people out there that are very good/great in FPS PVP, no matter their current weapon/gear.
I'm still having fun even with my bad K/D, probably will be getting steam rolled during Iron Banner lol.