I noticed that my unranked queue was taking forever (upwards of 5 minutes when I ususally can get a game in 5 seconds). I did a little research and a reddit post from a while ago suggested that some accounts were just kind of screwed and there was a bug causing huge discrepancies in unranked mmr between players and, therefore, causing huge delays in the queue.
For example, when I played an unranked game, I was against someone who didn't wall off as protoss versus zerg. I crushed him, and it wasn't a fair match at all. I was intending on using unranked queue to get back into the game after about a year of hiatus, but that seems like something that is no longer an option. Does anyone know what causes this?