Well, in Nixon's own words, he selected Ford as VP, because the House would never impeach Nixon, knowing Ford would be President. The perception of being a "bad" President, was mainly lack of support from within the Republican Party. Future President Reagan and other conservatives, viewed him and VP Rockefeller as "Limousine" liberal lite Republicans.
With a Democrat Congress, public perception and lack of respect and confidence of the White House following Watergate, the lack of leadership and inability of the Fed to control inflation and the economy, along with little support from the power players of the conservative right, left him helpless and appearing weak.