for my extremely limited experience in PVP they seemed relatively balanced to me.
when I needed 10 RBG wins to unlock an artifact skin, it only took me 22 BGs to get it, so 12 losses and 10 victories, and I was a total liability for my team, losing every 1v1 fight I got into, as I had very little versatility and zero experience in PVP.
nothings going on i guess, sometimes you are just unlucky. usually its quite evened out like Kayleen described, you just get the impression of a “lose streak”.