I've done exactly this. I live in a city with ok, but not great, public transit. When we started having constant issues with our metro, I started taking Uber to and from work.
It's more expensive than the train, but cheaper than buying a car, paying operating expenses, paying for parking at my apartment and paying for parking at work by a dramatic amount.
For longer uses or multi-stop errands, I grab a Car2Go or a Zipcar. For whole-day trips or longer, I head to National where I can pick any car from the Aisle for around $50/day.
It's more expensive than the train, but cheaper than buying a car, paying operating expenses, paying for parking at my apartment and paying for parking at work by a dramatic amount.
For longer uses or multi-stop errands, I grab a Car2Go or a Zipcar. For whole-day trips or longer, I head to National where I can pick any car from the Aisle for around $50/day.