I speak from experience playing the GOG version last year, which I've since refunded. My reason for refunding was due to repeatedly dying in the flying section of the game because I kept dying and respawning with inadequate health so I couldn't progress much further. And that's with only the first game, I haven't played Lost Company but I wouldn't be surprised if the issue I have with the combat system were also present there.

Having a combo-based combat system in a first person shooter is quite unique as few games come to mind that do this. But I think a glaring issue this series has with them is that they game never actually teaches you anything about them. There are no tutorials that goes in-depth, no move lists to review, nothing. Even a few reviews I've seen don't make any mention of it 'cause the game itself ignores its own mechanics. Which is a real shame because it actually seems to heavily rely on it; when you do a combo, you'll get boosted adrenaline and a slow-mo effect. If I recall correctly, I believe this even boosts your damage output. But when the game doesn't even teach you about this, or what combos you have available then it just feels wasted. It would actually decrease your adrenaline if you kept repeating the same move over and over, so you'd have to spice it up. Now it's even more of an offense that the game doesn't teach you about this mechanic.