The reason I chose "Tehran, Tehran" to watch was Mehrjuei. I admire him for his great works like "Hamoun" and "Tenants", but he didn't get better than those days. In fact he started to what you call "losing it".
But about the movie: Tehran municipality invited two directors (Dariush Mehrjuei and Mehdi Karampour) to make films about Tehran.
Tehran, Tehran (first episode, directed by Mehrjuei) is about a poor family who finds their humble house in ruins just before new year holidays .. (SPOILERS) >> They decide to spend next day touring Tehran, but they miss the touring bus. Accidentally, they meet a group of old men and women who are touring Tehran, they join the happy group; and finally rebuild their house with their help << (SPOILERS)
The story was unbelievably lousy. The characters didn't have any depth and director did whatever he liked, whether the audience believes it or not. Since I wasn't interested in Karampour's previous work (Who killed Amir?) I left the movie theater nearly at the end of the first episode.