Voss is a pray-for-spray weapon most of the time. I've clocked a decent number of hours but that was a while ago (recently had a rekindled love affair with the default rifles). Its good for unexpected encounters and multiple enemies, but I don't like it for anything past 15 or so meters, it just gets unreliable (at least in my hands).

Anyways, my unlocks for someone going Assault as a main (even if its just beating a dead horse after 6 pages lol xD):

1. Defib. Most essential item in any assault kit (and most of the time on TG ppl play/want assault medics) Reviving will also help you clock a lot of points early on and speed up the process. An assault character with just a defib and the rifle in the kit is still a very effective soldier -- rockets are nice but can usually be handled by...

2. Grenades. Oh how I love grenades... actually I don't really like them... but they're very useful for making hard to hit enemies go bye-bye.

3&4. Sprint/stamina upgrades. Not sure on the order of this but you get the idea. A mobile soldier is a safe soldier, yaddayaddayadda.

5. Advanced Med-Hub. More points, faster progression, more unlocks.

From this point you can start going for whatever weapon strikes your fancy. Personally I like the Scar/Krylov best but both the Voss and Baur are good for some situations, I just got the rockets since they rain sweet and sexy death on my enemies (baur is on that line I think so I ended up unlocking it first). Actually I think I'd follow this up to number 4 for whatever I wanted to do (like if I made a sniper soldier) just so I had the flexibility. Little side note... is the personal shield unlock under the Clark line? I can't remember... but if it is, who thought of that? Who's gonna drop down a shield then hop over it with a shotgun?? @_@ Then again its gettin a little late so I might just be getting my night-time crazies xD.