[Verginius Rufus]

Adams had a tough act to follow, being Washington's successor. He did some good things, like making peace with France (to end the "Quasi-War") when taking a more belligerent stance might have ensured his re-election. I'm not sure how much initiative he had in the Alien and Sedition Acts--they were passed by Congress and he signed them, but had he encouraged their passage?

Marbury didn't get the office he was intended to receive, thanks to John Marshall's decision in Marbury v. Madison. Picking John Marshall to be Chief Justice may have been Adams' most important legacy as President.

The election of 1800 may have been the only time that the 3/5th rule (counting three-fifths of the slaves when calculating the number of seats in the House of Representatives a state got, which affected the number of electoral votes) made the difference in the outcome--without the extra electoral votes in the South because of that rule, Adams might have had more votes than Jefferson and gotten another term. Whether he would have agreed to the Louisiana Purchase, I don't know.

[gorush]

"I'm not sure how much initiative he had in the Alien and Sedition Acts"

As I recall from all that I've read on the subject he was responsible for those acts being shepherded through Congress. It was his critics that these acts were intended to silence. (But I've been wrong before, heck, I voted for a democrat once.)