Your wrong, pay to win doesn't amount to an evolution of player skill. You can get capped to level 70 as fast as you want, that doesn't change a thing about your ability to actually PvP. When I started off at warzones, I was utterly garbage during the early months of 5.0. I'm a new player who started playing around the time the Knights of the Fallen Empire came out, if that gives you a good measure on experience and overall knowledge of things. As time carried on and I continued to queue up for more warzones, I finally improved as I adjusted my characters gear (through my own crafting with warzone crates) and enhanced my knowledge on my class through reading several of the guides available on dulfy. I'm not amazing, but I don't get ridiculously outclassed anymore and I often find myself near the top of the boards. I've played all three aspects of the Assassin specs, they took a little bit of research to understand but I think they all serve their purposes.
If your finding yourself getting outclassed by players who have upgraded via character tokens (who have blue gear) then two things: 1. You need to reevaluate how you PvP and perhaps try a different spec that suits you better or 2. Your going up against someone who plays other characters and they already have extensive knowledge on their classes.