Here is my top 3-
1. Tier the warzones (10-19, 20-29, ect)
Warzones break down to who has the most lvl 40's and 50 players. The complaint to "just level up" is worthless. Everyone should be able to have a fun in warzones and tiering the zones would work.
2. Allow to boot AFK players
We have started to see AFK players in games. Allow for vote kick by teams to deal with this.
3. Reward players with more medals for actually doing things that pertain to the match
scoring / passing medals, killing blows on a defend point, planting or defusing a bomb
What is your top 3?