While in theory you have a point, practice shows otherwise.     That's NA. On Eu on the same ship I have 64 % WR.  I can't produce the picture  coz I ranked out.Now....  I'm the first to admit that I'm not the most consistent player out there buut .....this variance (almost 20%!!!)  cannot be attributed to subjective factors,  alone.   That is one of the reasons, why I mock people's arguments, who think that stats are anything representative or deterministic. Also, MM is (supposedly) a simple roll of the dice, but Wedgie, by reducing line ups, have effectively removed the possibility to truly influence the outcome, in terms of winning (I can elaborate further on this if necessary).