If the structure was better. During the visit the visiting couple is always about to leave and then they don't. The situation constantly escalates and then everybody is back to normal even though in real life the insults exchanged would not allow it. And that is not natural. There should be a step by step escalation and not escalation, de-escalation, escalation, de-escalation. That would be a more natural structure. The writer obviously thought she could not hold the audience's attention otherwise. But if you somehow foreshadow the conflict to come then a gradual escalation is not boring but interesting.
The movie is advertised as a comedy. Is it funny? Yes, a bit. The actors are not bad. Britta Hammelstein is escpecially good. Mira Bartuschek is also good but her character comes across a bit mean, at least that is how she plays it. And that should not be, we should like all the characters otherwise there is no connection with the audience.
Again, some gags are pretty good, but as mentioned before the structure is not natural. After trading the first round of insults the party would be over in real life. But it goes on and there suspension of disbelief ends.
