Ok this thread is dedicated to Marvel's top voyeurs... The Watchers. Keep in mind that most of the feats come from Aaron the Rogue Watcher and Uatu, and both of them are pretty young by the Watcher's standards(meaning that most of the race is actually more powerful). All right here we go...
I'm sure that everyone's aware of Exitar beating the One(the head Watcher), and I know that people say that he was able to do it with ease, but I can assure you that they're wrong. Exitar actually spent several THOUSAND years prepping and gathering energies JUST to take down the lead Watcher... http://img529.imageshack.us/img529/1732/f440006gg6.jpg
[Turns out, the Rogue Watcher is the same being who originally witnessed the birth of Galactus].
"Destiny sees things as they are, not as we would wish them to be.
He knows there are no stories, only the illusion of stories.
Threads and patterns that appear in the pages of existence, and are given meaning by the observer.
Destiny observes worlds and molecules like motes of dust hanging in a sunbeam.
Every movement, every moment inevitable.
Destiny walks his Garden, a place of forks and paths which combine and part, seeing only what is.
He is surprised by nothing.
There is nothing that can surprise him, nothing that was not already written in his Book."