Dolphin comes with many features. Some are even not available on the original Wii gaming console.

You can save a running game whenever you want and reload a state.
Anti-Aliasing and Anisotropic Filtering makes the games more brilliant and realistic. Typically a game looks much better on Dolphin than on the original Wii console. Actual quality depends on the graphics card.
Play on maximum resolution in high definition up to 1080p. This is a remarkable feature the original Wii console lacks of.
Connect your Wiimote and Nunchuck to your computer for a better gaming experience.