When we vote for president, we aren't simply choosing a single person, we are selecting a team that reflects the president's values or lack thereof. We don't require a president who is a card carrying member of Mensa or the reigning Jeopardy champion.
Justice Oliver Wendell Holmes, meeting Franklin Delano Roosevelt soon after his inauguration in 1933, said of him, privately: "A second-class intellect. But a first-class temperament!" FDR had a successful presidency despite any intellectual shortcomings. He surrounded himself with smart and decent people (including the first female cabinet member) who had that best interests of Americans at heart.
Biden's cabinet is the most diverse ever and are reflective of Biden's genuine concern for Americans. Nobody has mentioned the terms "emoluments", "pocket lining" or "unreleased tax returns" in regards to the Biden administration.
Ronald Reagan was almost certainly in the throes of early Alzheimer's Disease by the end of his presidency, yet his administration functioned competently through the end of his second term. Even Woodrow Wilson who was bedridden with stroke in October of 1919 managed to complete his term successfully. Reagan, Wilson and Roosevelt (who was dying) are ranked in the upper tier by presidential historians.
What matters is that the president not be corrupt and surround him or herself with cronies or be insecure and surround him or herself with sycophants. Trump managed to be both.
Trump’s first 100 days were sheer craziness. Biden’s are sheer competence
Biden has picked well-qualified appointees who know what they are doing. Trump stocked his administration with relatives (Jared Kushner, Ivanka Trump), far-right extremists (Stephen K. Bannon, Peter Navarro, Stephen Miller), lickspittles (CIA Director Mike Pompeo), clueless rich people (Secretary of Commerce Wilbur Ross, Secretary of Education Betsy DeVos, Secretary of State Rex Tillerson) and ethical disasters (Interior Secretary Ryan Zinke, Health and Human Services Secretary Tom Price, EPA chief Scott Pruitt). National security adviser Michael Flynn had to resign after just 24 days for lying to the FBI. Biden’s national security adviser, Jake Sullivan, has already served four times longer than Flynn. So far there isn’t a single clunker among Biden’s senior selections.
Let's review: Some of Trump's "all the best people
Betsy DeVos: Has tried (unsuccessfully) for three consecutive years to make cuts to the Special Olympics.
Bill Barr: Cleared President Donald Trump of all obstruction-of-justice allegations in a letter summarizing the findings of Special Counsel Robert Mueller’s Russia investigation.
Donald Trump Jr: Met with Natalia Veselnitskaya, a Russian lawyer with connections to the Kremlin, in New York’s Trump Tower in June 2016
Ivanka Trump: Placed her company in a trust run by family members when she became an adviser to the president in 2017, and continued to receive a share of the profits.
Jared Kushner: Until March of this year, owned a stake in Cadre, a real-estate investment firm that sought to benefit from large tax breaks by investing in Opportunity Zone projects, a program that Kushner (along with his wife, Ivanka Trump) had pushed for.
Kellyanne Conway: As a counselor to the president, advised Fox News viewers to “Go buy Ivanka’s stuff” in February 2017, triggering an inquiry by the Office of Government Ethics.
Michael Cohen: Pleaded guilty in August 2018 to eight criminal counts, including tax evasion, making false statements to a financial institution, and violating campaign-finance rules by making payments, as Trump’s personal lawyer, to the adult-film star Stormy Daniels and another woman at the request of the then-candidate to keep them from speaking publicly about their alleged affairs.
Mike Pence: As vice president, defied congressional subpoenas and failed to provide various documents requested by Congress during the 2019 impeachment inquiry.
Mike Pompeo: Initially claimed little knowledge of the July 2019 call between Trump and Ukrainian President Volodymyr Zelensky, which led to Trump’s impeachment; it was later confirmed that the secretary of state was on the call
Roger Stone: Self-proclaimed “dirty trickster” who encouraged Trump’s racist birther conspiracy.
Stephen Miller: The chief architect of Trump’s family-separation policy
Steve Bannon: Charged in August with wire fraud and money laundering related to the organization We Build the Wall.
Steven Mnuchin: Failed to include $95 million of his assets on Senate Finance Committee disclosure forms during his confirmation as Treasury secretary, along with his role as the director of an investment fund located in a tax haven.