Ahh, you again
Tzeentch is stated with a 66% win rate, not 47%. Please read the statistic correctly.
Furthermore, 3.22% is quite ok for the metal?
They are in the range of armies like Sylvaneth, Nurgle, Overlords, Seraphon, Gitz and Nagash.
And besides, the winrate is even more impressive with the rather small amount of players with this army...
Again, maybe it is you who have no clue what Slaves actually are, and not the authors (I just recited your words). A lot of people have fun with this army. Who are you and whom do you speak for?
I am out of this discussion now (ignore).
Good luck.