The matter of divorce is an Israel-only problem where power over marriage and divorce is in the hands of the rabbinate. As the IMDb Summary notes, civil marriage and divorce does not exist in Israel. Thus Gett may be incomprehensible to non-Jews outside Israel where marriage is a civil matter but can be licensed to religious authorities. Judaism has this further peculiarity that the man must consent to the bill of divorce (the Get)for the divorce to take place. Normally,this is a formality and Israeli couples can part and resume their lives.
Without a Get, neither spouse can remarry. If the man abandons his wife and leaves the country, the woman is in a legal limbo. This was the subject of an earlier short Israeli film, Ha-Get. In Gett, the man is available but refuses to consent. The Rabbis try all the limited avenues available to force consent (take away the driver's license, jail, etc.) but can't force the man to sign. That is the basis of Gett.
I have given Gett a 9 despite the lack of action and the focus on a less than universal problem. My reason is that, while watching Gett, I found similarities to the classic 12 Angry Men. I realize that it's a different courtroom and type of case on trial but that static tension is present in both films. The second reason is the acting skills displayed, particularly by Ronit Elkabetz. Even if you knew nothing about the divorce problem in Israel, you can read in Ronit Elkabetz' character the agony and frustration that getting a Get can cause.
I highly recommend Gett.