Why does everybody think Thomas Jefferson was so great?

seriously, he wrote the Declaration, which was good but he basically did nothing during the Revolution except be a horrible gov. of Virginia. He was against the Constitution. He paid Thomas Calender and others to slander Pres. Washington and Pres. Adams when he was supposed to be part of their administrations. He refused to cross party lines and help Pres. Adams end hostilities with France. He was probalby one of the most cut throat politicians we have ever seen. As president the only things I think he did that were any good were promoting the separation of Church and State and the war with Tripoli, both good moves. but other than that what? We basically lucked into the Louisiana Purchase, its not like TJ did any great negotiating or anything. The Trade embargo was an absolute diasater and his VP turned out to be a murderer and a traitor. And I haven't even mentioned the whole slavery thing or Sally Hemings and the fact that he had slave kids who he didn't free. I don't understand it!!