I myself said here on numerous occasions in the 2008 election season that if we elected McCain we might as well kiss the country goodbye, because he would continue and expand every Bush/Cheney policy.
I said that if we elected Obama it would at least give us a CHANCE of BEGINNING to right the country, but that it would only be a CHANCE, because ONE MAN could not undo all the damage that had been done.
Then, unbeknownst to anyone, a cabal of Congressional Repubs got together on Inauguration Day and swore to block everything proposed by Obama.
And to the best of their ability, they have done so. It should amaze any reasonable observer that Obama and the Dems in Congress have managed to pass any legislation at all.
You are right about one thing: Obama is not King. He can't pass laws -- that is Congress's job. He can't change laws, either. He has no magic scepter. His is the Executive function, and the Commander in Chief, and stuff like that. But there is a whole lot of shit he CANNOT DO WITHOUT CONGRESS.
And then there is the Intelligence gathering branch of government --> BUSH/CHENEY'S LEGACY in its current iteration <-- which apparently runs semi-autonomously, like a 4th branch of government. CONGRESS is going to have to untangle this rat's nest. But the Repubs in Congress seem to only be interested in rat-f***ing, which is dirty tricks as done by Tricky Dick Nixon.
As for bequeathing power to all his successors, Obama quite recently TOLD CONGRESS TO SCALE BACK some of the powers of his office. Congress is the entity that has to do that, since they expanded the powers of the office to oblige BUSH/CHENEY.