I would say brew it. Not because of a "you-don't-want-to-waste-it" type of mentality... but because of a "kits-and-extract-probably-sit-in-a-warehouse-for-longer-amounts-of-time" type of attitude.
But I would also say throw it out and buy new ingredients in order to increase your chances of brewing something that tastes good in the end. At least if comes out tasting wrong you can eliminate a reason.
I have commitment problems I know.
Primary 1: Whiskey Stout
Primary 2: Apfelwein
Bottled: Oat Red Ale, Peach Wheat, Strawberry Dirty Blonde Ale, Brown Sugar IPA
In line: Cucumber Summer Blonde, Kona Pipeline Porter Clone, Bacon Porter
The best yet: St. Nick's Dirty Stout (Vanilla Gingerbread Stout) - guessed at the recipe when boiling, didn't write anything down... DAMN.