No.
Any video game player base isn't some static thing that gains knowledge after X hours of play or X number of levels.
It gets a bit old explaining infinite cycles to people, but all I can suggest is to think deeply on this: For every expert player that retires from this game, you have one that joins with zero MMO experience. Therefore the player base is constantly morphing into something different. Always.
My dude, modern basketball has been around since something like 1890. Does that mean if you head down to the park right now, all the guys on the court should be pros? Does it even mean that the 30-year-old guy that's been shooting mediocre hoops since he was nine should be any better?
No one can assume with any degree of accuracy how another, random person will perform at any chosen sport, including video games. Not at first glance. You do some research on the person, then maybe. But not at first glance.