Quote Originally Posted by ironchef
What makes silver surfer so good?
Faster than the Flash and stronger than Hulk. Although he doesn't look it, Silver Surfer is beef.

Quote Originally Posted by Wikipedia
The Silver Surfer possesses vast power known as the "Power Cosmic," gained when Galactus restructured his former body. He has the ability to channel ambient cosmic energy into his body at will, and expel it violently as concussive force or gently as a means to restructure molecules according to his mental design. The Surfer can generate beams of energy with sufficient destructive force to destroy a planet or, by contrast, generate such subtle amounts of energy to restructure the molecules of the natural pigments within a plant to change its color. The Surfer can rearrange the molecules of matter to create other configurations and can even directly transmute elements. While he can use his power to revitalize life energies and heal the wounded, there is no proof that he can create life from nothingness or return the dead to life.

The Surfer possesses Class 100 strength, meaning he can press over 100 tons. Additionally, the Surfer can use the Power Cosmic to amplify his physical strength to a level at least rivalling that of an enraged Savage Hulk. In addition, his body can move and react at metahuman velocities, he routinely navigates asteroid fields and attacks entire amaradas of starships at near light speed while maintaining surgical precision.

By using his board to exceed 99.9% of the speed of light (186,000 miles per second), the Surfer can shift himself into hyperspace, a dimension in which velocity is not limited by the speed of light. The Surfer can also compress his own bodily matter so as to shift himself into a so-called microverse. Additionally, he can phase his body's molecules to pass through solid matter or energy. The Surfer has demonstrated his ability to manipulate "temporal" or "chronal" energies and thus has proven himself capable of travelling to the past.
Bad@ss & A Half.