I'm not a friend of Slate, but they can be right sometimes:

But one secret to Giuliani's debate success is that he doesn't mind fudging all those facts he cites. In the Tuesday debate, Giuliani asserted once again that he had passed 23 tax cuts as New York mayor. This is an exaggeration. According to Factcheck.org and Politifact.com, he can rightly claim credit for about 14 of those cuts. One of the largest cuts for which he claims credit he initially opposed for five months before changing his position.

He also claims to have added more cops in New York than he actually did and cherry-picks data to support inflated claims about the number of adoptions during his tenure. After the Tuesday debate, Factcheck.org found a host of new faulty claims.