u probably wont get promoted if your rate is 50/50 cuz that means you are at a league that suites your level of play. i rmb when i was in bronze, i had 50/50 till some point i improved alot, i shoot up 4 win 1 lose rate for 20 games and i got promoted, then at silver, im at 5050 again till 1 point i shoot up till massive win rate den here it goes....

i used a new account to try NA server, i asked my 5th placement match opponent wat rank he is cuz im doing my placement....wna noe how well im doing and he went...........YOU ARE LIEING U MUDDAFUKKAAA  and raged alot. cuz......he said blizzard showed im favoured and he is a plat.

well, i went 5-0 without hassle in NA server but blizzard gave me plat only =(((( with 100% winrate. =))))))))

but i dno why, i feel SEA server ppl is pro-err....i dno la...but guai low memang tak tau main video game -.- maybe we got some asian blood same as koreans XD