While Minami-ke Okawari has disappointed throughout its run, rehashing the same tired old jokes, the penultimate episode at least improved enough to hold out some hope of not being a complete disaster. In fairness, the this series did end on something of a high note, abandoning many of the principles that made this show so boring (particularly compared to the relative funniness of Minami-ke itself) and preferring instead to focus on the emotional aspect of Kana and Chiaki's relationship with Haruka.
While the series finale was maybe too saccharine for the tastes of some, I personally found it to be really quite sweet - Despite all my criticisms of this series, I have enjoyed the characters (despite their often being rather clichéd at times), and thus the ending left a bit of a lump in my throat, while the episode as a whole left me with a bit of a smile.
Overall, this is a series to avoid if you're looking for a slice-of-life comedy due to the simple fact that it's so repetitive and forgettable. The first thirteen episode run of Minami-ke showed what could be done with the characters on show with a reasonable degree of competency, but sadly that all seemed to drain away with Okawari, leaving this likeable trio of sisters to do little more than drown in mediocrity.