Not intending to flame, but when only 2 people in the top5 have a ~2 kpd something is up.  Most of the great players are in the top 75 because you can see their performance over time.  A certain clan stacked maps and bomb/rescued hostage to get their players in the top5.  Since, wL is a point based rank structure those who play the most or plays on off-peak hours have a high rank and are par at the best.

Many of the "good" players are team stackers too (I had a tracker and it was quite sad when I saw that most regulars chose the easy team). 

I usually identify the good players by the ones who do well, help their team, and join the underdog/switch to help the losing team.  They usually don't care about their kpd, acc, but still have decent ones.

They usually have ~2+ kpd and ~25 acc.  These factors aren't tell alls, but when a person can maintain decent numbers on the harder team with a full server illustrates the main point.