First in most competition 5v5 games from Brink.tv or Gamebattles you don't see heavy's on teams. Why is that is because there hit points are two low. Splash Damage needs to up the hit points so they can be the tanks they need to be. I also think a light should not be able to knock down a heavy with a slide. Also they are so slow and so big they need to be bullet sponges which right now they are not. The Heavy is the 3 option in body types and this would be a way to help even out the odds.
Next is the class ICON. In a competitive match you want to know a persons class more then their name but when you are focused in on three guys shooting at you it is hard to pin point the medic out to focus fire on him first. Not saying this is a big deal or game changer but It would be nice if the Icon was over either over or under the players name about 2 font points bigger then the name. It would help out.
The Bars listed under the gun stats does not do the stats justice. Numbers would be a better way to convey what a guns attributes are. When you buy the strategy guide you get numbers instead of bars and he helps way more.
These are a few suggestions for Splash Damage. Maybe they can make the changes this game. If not implement them next game.