It would be like Halo's gametype, fiesta, where everyone got a random weapon every time they spawned.
ohhhh the potential this game could have... why stop at weapons? Tank with smokebomb.. assassin with ice traps and a jet pack, sniper with the tank charge etc...
Sad thing is, an assault with his default skills, an AR, and a minigun is probably the most overpowered of all the various combinations.
An Assassin with a tank charge seems very overpowered. Slap gold skill on that and let the fun commence.
Gunner with Cloak, Bomb and Charge along with minigun and shotgun would be INSANE. Sniper with the assaults passive would be the funniest thing in the game. Imagine all the funny jumps you could do, Steel Peel floor to ring would be funny as fuck.
Assassin with your choice of firebase or hack (or both) instead of either sprint or smokebomb (or both). Can call her a Saboteur.