Has someone repeated the statistical analysis done lately? From a few random sessions (D3 EU) it appears well over 50%, on a bad day/time more like 90% of the 1v1 player base are some kind of freelooser/smurf.
I suppose I have mostly myself to blame for not having taken the time to start the game earlier (formed a family during the start and peak of SC2), and for not being clever enough to find the correct mistakes to learn from among the responses to troll builds and even just crisp timings and strong micro, but it would strongly improve my motivation if my wins were not only freelosses and the occasional failed troll attempts.
In regular human endeavour, an opportunist fraction of 5-10% is to be expected, so already the 20% seen by @Trias is high.