One of the things I don't like about Hexar (or whatever it's called) is that how good your character is depends on how long you've been solidly playing. I'd prefer a Team Fortress style one, where you get to specialise without making it a who-has-more-free-time-wins situation. Anyway, I thought the 'lets give Soldat character classes' suggestion is on the no-no list.
For the moment, by character class is 'Shock-Attack Machinegunner'; in Team Fortress 2 terms that'll be a cross between the Heavy and Spy- good at ambushing with a heavy weapon.