I'm fine with Operation N-Night at Port Cacao because of a number of factors, like you some of you guys already mentioned:
1. It gives you a time and date for the squad to prepare in advance, even get out of the sector altogether if need be.
2. It is also part of an interesting quest to round up former members of a gang in the sector, giving you a major boost to battle preparedness. Did you see those grannies in battle? They're absolute units!
3. The enemy does not come in punishing waves after waves, with scant time to prepare in between, exacerbated by no pause in the game.
If Sector A8 had even one of those I would not feel the need to complain here. When Biff radioed his message first, I could clearly see that an enemy squad was heading to the sector, so it gave me an incentive to fight them, and I did.
I thought the situation was resolved, since there was no more update to his situation. So when I went there, and the only thing that gave me the slightest idea more trouble was in the offing was the battle screen with 'siege' plastered on it. And you're suddenly stuck there in a fight to the death. Sure, different situations warrant various reactions and should force one to adapt, but this is not in keeping with what the game has set me up to believe is reasonable in the hours preceding this event.
1. One can usually see the enemy squad operating in the satellite view. Biff's first radio message coincides with an enemy squad heading to his position. I think it's reasonable to expect at least a few more enemy squads nearby to either prepare or disengage from this siege.
2. You are expected to retreat if things become too hard, and it's a legitimate tactic in this game. In Sector A8 you're stuck even if you talk to Biff to trigger the waves or not.
3. I thought Biff was portrayed a cowardly character so I sure expected another call at least from him if there was more trouble to be expected.
There are a lot of things the developer could've done to make this particular event more palatable. Heck, they did that for Port Cacao, so what stopped them to apply a similar system for Sector A8 as well?