Fight History -
In prior games you could go check your fight history and check their fighternet profile etc. Why was this removed? It was very helpful to game plan for opponents and also to see if you came up short against someone you should or shouldn't have.
Very puzzling removal.
Tracked Rivalry -
In my opinion tracked Rivalry from quick match invites shouldn't extend over to Ranked. I'd like ranked and player matches to be tracked independently.
Category leaderboard -
I'd love to be able to search and see who has the most sub wins online, sub losses etc. Maybe include a badge on the rivalry "wins" counter prefight that shows that they're a sub specialist or something if they're number one?
It's very frustrating as a player that plays for leaderboards that we've taken a step forward in matchmaking (debatable) and a step backwards in all other aspects.

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