Have you looked into how World of Warships does their matchmaking? It is purely based on the ships [
http://wiki.wargaming.net/en/Battle_Mechanics_(WoWS)] and does not have a concept of infamy or player skill. What this means is that the battles might seem equal and fair on paper, but in practice good players dominate the matches and it's entirely possible that the other team is made out of 30% winratio beginners while the other team is full of 80% winratio pros. This means there are no guarantees and the matchmaker is not even trying to create matches which have 50-50% winning chances. It only makes sure people are playing with equal gear.
So why is Battle Bay not using this approach? Two reasons mainly:
1. Battle Bay has a much more complex and deep progression game. While it's pretty straight forward to create matchmaking buckets based on 10 tiers of ships, Battle Bay has ships, items, crew and perks to consider. There is no single easy linear progression scale which to use as a matchmaking bucket. This means we would need to decide how to value all the progression parameters relative to each others, and it would be inherently unstable and unfair system as it would be an end result of our subjective opinions.
2. The MMR based approach in Battle Bay is more casual. It means even the worst players can still play the game with ~50% winning chance, they just play on the lower tier battles. With gear based matchmaking they would be just losing, and losing, and losing, until they quit. Making the next worst players to start losing more, until they lose and lose and quit etc.
How about a combination then? Well, they doesn't really work together. As soon as you start mixing some other variables into the mix, the MMR (infamy) loses its meaning and it breaks down.
However, what we could do and have considered is to do basically a cosmetic-only team shuffles based on other variables. In that model the matchmaking would still be based purely on infamy but after we have a group of people who are interchangeable when measured by infamy, we would use some other parameters as a secondary sorting key. This would not make the matches any more fair, actually they would become slightly less fair, but it might make battles that seem more fair in the eye of the players.
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