I don't think gin every goes bad like other distilled spirits. It is, however, a drink very much preferred over vodka in some parts of the world. A lot of people don't give gin much thought when making cocktails, but there are a lot of really good ones you can make with a really good bottle. From the basic gin and tonic, martini, to more complex and flavourful ones.
I honestly fancy myself a Gin Sling (Singapore Sling) every now and then. All you need is your go-to trusted brand of dry gin, soda water, lemon juice, cherry brandy and lots of ice. If you want to spoil yourself a little, you can even add a Maraschino cherry for a burst of extra flavour.