At first, looking through the first image (Ranked PvP) there seemed to be pretty good diversity both within and between selections.
Looking through the second image, I started to see a fair few repeats (of the same opponent, mere selections apart). Diversity of teams within the same selection still seemed pretty good, though (i.e. you never faced 3x Dragon Eye defences).
One part of a request could be for greater sensitivity to Hero Weapons, such that you only ever face Dragon’s Eye teams every second selection or greater 
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I’d want more stats, and from multiple people - although perhaps being able to get sufficient intra-selection diversity in this small sample means that half of the issue isn’t always present.