I started playing this game during the launch of Wotlk. I managed to reach 80 towards the end of Naxx's life cycle. I enjoyed raiding to a low level, I had to do quite a lot of work and couldn't commit properly too it.
However I would not consider myself a bad player. I was one of the best tanks in my guild and in most PUGs I seemed to do better than the other tanks.
But I, and many others, have been labelled as being poor players. I played with a lot of vanilla and BC veterans and they were no better than the Wotlk joiners that we had. So what do you have over us? An inflated ego based on the amount of your life that has been sucked into this game.
TLDR: Stop generalising "Wotlk scrubs". Its intolerant and often just wrong.
EDIT : Oh and this is in this bracket of threads because I so often see threads in here complaining about "Wotlk scrubs".