I read the negative comments before viewing this film and undeterred, went ahead and started watching. I admit that I had to rewind quite a few times as the film is incredibly complex, involved and full of detail. That is a good thing but also, quite unexpected in this culture of car chases, explosions, gratuitous sex and general violence that substitute for plot and character development. In fact, what a welcome departure, however, I am so used to not paying a lot of attention to what I watch.
This film is chock full of character development and plot line; the kind that we used to analyze when I was in high school. It requires actual mental participation on the part of the viewer. What a nice change. I would compare it to 'All The President's Men' in terms of generic subject matter. That is, it is a mystery about intense misconduct on the part of elected officials and those with enough influence upon officials to essentially 'own' them.
Unlike 'All The President's Men', this film makes an effort to give a couple of the characters actual personality. In this sense the movie is a character study like 'The Negotiatior' with Samuel Jackson and Kevin Spacey. In that movie, their characters are both city employees and the plot is extremely intense. Yet, the plot is dependent on the ability of their characters to cooperate with each other, trust each, and ultimately unite together against the corrupt Police Department. There is more gun fire in this film and the specific plot is different but generically, there are many similarities.
I WILL say that City Hall requires a whole lot more concentration. In fact, I was struck how parallel it was to past and present political scandals I've seen in my life going back to Watergate. The thing is, the public knows that something is wrong, for sure! but following the details is hard to do. This movie is not even close to being as complex as real life but it actually is realistic to life in its complexity. I think that is one of the reasons that previous posters have criticized the film: unrealistic expectations.
If one watches this knowing what they are about to see and are up to the experience, it really is excellent! I watched it 3 times in a row! The acting is superb and the directing is flawless. The weakest link is John Cusak's accent.

OK, it's very rare that I complain something I got for FREE. So I guess this movie pushed me over that limit. I saw it at the Hollywood Cemetery for FREE and walked away very very disappointed. One audience member's question to the director about using the Native American references just as "bookends" instead of being weaved into the movie better, basically says everything that this movie FAILED on.
NATIVE American REFERENCES--- The Native American references felt really out of place and contrived. It's obvious that this director and writer tried tackling an arena they never played in before. They should have stuck to the old adage of "write about something you know". IF they are in fact versed in this it certainly did not show on the movie or the beauty of this unique culture was not given proper justice.
Clichés and ON THE NOSE--- I agreed to see this film on the basis that it was an indie. So I held it to higher expectations. "Little Miss Sunshine" was an indie and saw it before it became so popular. Before it even came out to wide release I was already raving how it's going to be a hit. UNFORTUNATELY I could not say the same about "Expiration Date". "Sunshine" took us to cliché incidents but the filmmakers were so clever at their approach that the outcome would take us to a different direction avoiding the trap of being a "cliche". This movie on the other hand had no way of not falling in the trap because it was already TRAPPED from the start. The psycho mom's antics, the Hendrix couple, etc.
I hate to say it, but the best and WORST movie I've seen this year were both indies. "Little Miss Sunshine" being the best and this movie being the worst. I wish I could say otherwise.
But I do congratulate the filmmakers for having such a good turn out from their family members at the cemetery.