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The casting is pretty decent. Tina Fey and Amy Poehler who have done a few movies together and Saturday Night Live for awhile now have really good chemistry with each other. Them as sisters is pretty believable.
Like I said its a typical American comedy so don't expect nothing but a few laughs here and there even though some of the scenes and plot is incredibly stupid.
Worth watching on a weekday or just wait for cable. You are not missing much.