It is terrible to solo queue for normal WZ's before 9-11pm (depending on the day) Eastern on the Imperial side, you will win maybe 1 out of 10-15 matches. Okay not really, maybe 1 in 5, but there are strings of 6-8 straight losses early in the evening some days. Later/night Imps get closer to a 50%+ win ratio depending on the number of premades.
For ranked matches, there are literally only 2 competitive teams that demolish everyone else, and depending on who you ask, may or may not be competitive with each other and depends on who comprises each respective team.