It seems like my "I just wish it had" moments are based on information. Only lvl 10 so I have only played with maybe a quarter of the tools available.
Weapon damages, ranges, accurate information*, being able to see my opponents builds at the end of a match. It strikes me as so odd that they use the vague bar system. There is no reason not to have solid numbers because they're easy to change.
A serious improvement especially in this beta state would be a simple "play again" option. I've had amazing matches against people where it was close and these are the most fun. However in between it varies a lot from clean defeats to outright pub stomps. It always a shame when my squad goes from a good match against another squad to a pub stomp, which isn't any good for either side.
Another big improvement but also odd thing. Is inability to go into practice mode with a squad. With the beta MM my friends have to be warned they will likely get matched against lvl 20+ players who will decimate them. Getting more familiar with working together in a non competitive environment would help learning a good bit.
Recapping points I just hope these things are added to the game in the future
-Information, Information, Information
-Play again option after a match to play same team
-ability to take entire squad into practice
*looking at you damage amplifier with the same description as weapon amplifier, was so confused every time I lost energy and couldn't move.