Suggestions:
 
Melee: The one-hit-kill stealth mechanic is dated and poisonous to remain a factor in the game given that it's the only quiet method of killing that we are aware of in beta. It would be better if the knife had a higher damage (enough for two quick strikes to kill or one full charge) and the stealth mechanic being a damage boost rather than a boolean kind of deal.
 
All Enemies: Please give us details on how much HP these enemies have, and if they have any kind of damage resistance.
Flamer: The SS Doomtrooper look is cool and all but they're not unique. It's a generic cliche and the more appropriate regular soldier with a flamethrower would be more appropriate. The SS didn't have the stylized flamer troops.
Elite SS: The black is 'too' black, and the gas mask is a bit much. Personal thing. Probably equipped with an STG44 would be best, if they don't have one already.
Basic soldiers: For larger outdoor maps, more soldiers should be carrying K98 rifles. In closer areas or bunker maps, there should be MP40s.
 
Headshots: Perhaps to fix the issue of fighting against the healthbar rather than fighting realistic soldiers in WW2, there should be a higher headshot multiplier to compensate. It's ridiculous for a soldier to soak 3-6 shots from a carbine rifle like the M1 Carbine and still be running around. The same goes for the C96 pistol. The damage should be higher, or there needs to be more done to adjust health and durability.
 
Weapons:
Unlocks - Hipfiring challenges are dumb and will do a great job frustrating people who want to unlock things without any guarantee to fix some problems. Headshot challenges are fine. Very high kill count challenges are a bit crazy given that this game doesn't feel like it's supposed to be Payday style of infinite cops. But again, with guns that do pathetic damage and poor accuracy, we have more issues meeting these challenges unless we sit there grinding for hours.
 
Accuracy/Recoil - It's hard to say the major issues with the guns at the moment given that we only see five guns. But one of the biggest problems again is the damage and the inability to keep shots consistent make things difficult to enjoy. ADS does help somewhat but not very much given the precision needed to deliver kill shots.
 
Skills/Warcry - I think there's a little too much emphasis on these skills to fill the holes left by poor weapons or gameplay. Especially since I'd wager the best squad would just be 4 Assaults for sustained fighting and infinite health.