This piece rings of truth, like a mirror reflecting everything, the bad as well as the good. One doesn't seem more prevalent than the other, even though it ends positively. He takes the time to set each scene, see them through, and bring them to their logical conclusion. He has put everything on the table, the highs, the lows, the frustrations, the bad communications... I think every couple with children will see parts of themselves in it.
It's not he kind of movie you see to escape reality. It won't pull you down either, and it is funny, but it's very realistic.
Even though this is supposed to be be a sort of followup on the secondary couple of Knocked Up it has nothing of the goofball stuff of the first movie, except with one very little scene with an employee.
The acting is excellent, I love Paul Rudd, and this might be his best performance. Leslie Mann is excellent too. The only low performance was from Iris Apatow who plays the youngest daughter.
The script is excellent, everything is logical, no flaws, and well orchestrated.