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].
"A great tactician creates plans.
A good tactician recognizes the soundness of a plan presented to him.
A fair tactician must see the plan succeed before offering approval.
Those with no tactical ability at all may never understand or accept the plan.
And when a mind is too deficient in understanding, the resulting gap is often filled with resentment."