I think it's really volatile depending on the time you play. I cruised to 3 in the afternoon, but late in the evening, I was facing high ranked legendaries. Just not as many people playing sometimes so the skill is all over the place maybe.
Definitely. As soon as it hits midnight mountain time it gets way easier. Was about to hit rank 8, decided to switch to a vanilla zoo, and now I went on a nonstop winstreak to rank 5.