If someone in your party has a hammer or similar armor-busting weapon, this boss is quite easy. He goes down very fast. But if matchmaking throws you into a group that has no such weapon, the boss is almost impossible to kill.
It is only possible to damage him with the following in that situation:
- Fully charged melee attacks (very slow, high risk)
- Headshots (extremely difficult, low damage relative to his HP)
- Bombs (limited, low damage)
- Certain class abilities (limited, low damage)
You need a hammer or equally strong anti-armor weapon to beat this boss in almost all situations. It might have been possible to whittle him down without such a weapon in your party, if not for the continuous flood of adds - including more armored enemies - that must be dealt with.
As it stands this fight is either trivial or essentially impossible, and nowhere in between. I’m not sure what the solution is, aside from removing or reducing his armor drastically. I feel that something needs to be done though because I don’t think it is Fatshark’s intent to make certain builds/loadouts mandatory for certain missions, especially in Quickplay where you have no control over party composition.