How Is Mace 4-B, and Dooku isn't ? Dooku was equal to Mace,and then becomes even stronger as a Sith ? Obviously Mace got stronger as well, but Dooku has been shown to at the very least keep up with Yoda. Anakin even more so when focused absolutely decimated Dooku, and has been stated numerous of times to be the most powerful Jedi
Anakin has unprecedented power in the Force, making him the most powerful Force user in history: This makes Anakin, in effect, a Jedi Master, a rank that Anakin, with his unprecedented power in the Force, feels has been long overdue. Source: Star Wars Miniatures: Ultimate Missions: Revenge of the SithThis is Anakin Skywalker:
The most powerful Jedi of his generation. Perhaps of any generation. The fastest. The strongest. An unbeatable pilot. An unstoppable warrior. On the ground, in the air or sea or space, there is no one even close. He has not just power, not just skill, but dash: that rare, invaluable combination of boldness and grace.
He is the best there is at what he does. The best there has ever been. And he knows it. Source: Revenge of the Sith
Gillard also reports that the duel will explain how Obi-Wan is able to defeat his protege, even though Anakin has been established as the most powerful Jedi who ever lived. Source: The Making of Revenge of the Sith
"Fully defeated by just anyone, the dark side cannot be, but only by the Chosen One. And who might be this Jedi? Know I do not, but not yet born is he or she. This much, sense I can. A vessel of pure Force the Chosen One will be, more powerful than any Jedi in history." Source: Jedi vs Sith: The Essential Guide to the Force
"Even after all these months, she couldn't make herself entirely believe that actual Jedi blood ran in her veins-not only Jedi blood, but the blood of arguably the most powerful Jedi in history."Source: Luke Skywalker and the Shadows of Mindor
Anakin Skywalker is the most powerful Jedi in over a thousand years. Source: Star Wars Miniatures: Ultimate Missions: Revenge of the Sith