Okay Rammbock, here goes, please all just my personal opinion.

Regards
Tinus
General audio:
Good choice of music; I love the Company of Heroes theme!
SFX; I would suggest sometimes there could be more emphasis put on special effects sounds ie engine sounds and explosions/battle sounds. I loved the continious radio chatter.
Cinematography:
0-0:19 great title sequence!
0:29- 0:36 nice historical footage briefing montage
0:38-0:54 nice historical footage start-up/taxi sequence but some clips too dark and difficult to see what is going on.
0:57-1:01 moving controls in cockpit scene without pilot hands look unrealistic especially if your audience are not IL-2 players. (general You Tube viewers)
1:02-1:23 very good shots in the take-off scene with good camera angles; again some of them are too dark and difficult to see what is going on. I know you want to simulate night but one must still be able to see what is going on.
A “rule” of filmmaking is broken here; directional continuity. If you decide that the allied aircraft fly from left to right then it must be presented continuously in take-off and through out the movie. The axis on the other hand must always be presented in the opposite direction. Dog fighting is kind of Omni directional.
1:34-1:40 I love this fish-eye tracked shot; very artistic!
1:46-1:55 The contrails emanating from the B-17 tail plane look very funny and unrealistic; Try another mod or change camera angle not to show this mistake.
1:57-3:00 Some beautiful cinematography, good and interesting angles.
Sometimes parts of the cloud formation suddenly appear and disappear (at 2:29-2:30) and is a bit distracting ?.
I feel some of the shots are extremely over exposed resulting in large patches of white smudge on the image; but maybe it goes with the overall look of the movie?
3:00-3:16 Great Mustang shots; again the last clip is extremely over exposed.
3:19-3:26 Nice historical German newsreel scramble sequence. Just note again the continuity issue at 3:26 ; in the historical film the Germans scramble in complete snow and icy condition with Bf109’s and then immediately switch over to IL-2 where there is no snow and the planes changed to Fw 190’s .
3:27-3:59 take-off sequence; nicely done, love the misty blurry look: just watch the direction of take-off got switched several times
3:60-6:26 Very nice battle sequence; love the look and continuous radio chatter. The opening contact scene is impressive.
One thing noticed is the omission of the German stabilizer swastika emblem and thus a break down of the historical accuracy.
Some shots the aircraft have contrails and with some shots there are no contrails, discontinuity issue.
6:30-end Very good and unique shots of returning aircraft. In my opinion too many fades to- and from black.