Those mentioning the 5 min estimated queue times, but getting 10-30 min waits, I've also experienced this as well. My best guess is that for the roulettes that allow players to join as parties, there are a lot more people logging on and running them as set groups instead of queueing individually. That way you'd get lower estimated queue times, but there isn't any available space in the groups that are queueing. Now, if that's not the case, the only thing that could be happening is a huge burst of players coming on in a very short time frame and queueing up. Those following the wave would get really low estimated queue times not representative of their actual wait time.