What's the Most Realistic Artificial Gravity in Sci-Fi?

2001: A Space Odyssey introduced a lot of people to the idea of rotation based artificial gravity, but in sci-fi, it’s far from the only one to implement the idea! Babylon 5, Halo, and Ringworld also used rotation-based artificial gravity in their stores, but, being an astrophysicist I had to ask, WHO DOES IT BEST? And more importantly, is artificial gravity in space possible?