The current game interface is ok, but the scoreboard (when you press Tab) is very bad for identifying the class makeup of your team. A picture of the merc is not at all helpful, especially when new to the game. I gather that each merc is reasonably unique, but they have some things in common, such as deploying ammo, or healing, or having lots of health and a minigun etc. Thus it would be a lot better to have one (or multiple) of the following: an icon representing the merc’s class, the merc’s class written in text, or the merc’s name written in text. All of those would be a lot more useful for assessing the make up of your team and working out if you need to switch to Medic or whatever.
I think I had more suggestions regarding the interface so I’ll edit this post if I remember them.