Andrew Caldecott QC, likened Sorrell's action to a "bowl of spaghetti Milanese" with jumbled pieces of evidence, superficially tasty in parts.
Sorrell is suing for libel and invasion of privacy. His action was sparked by an e-mail and internet blog said to have described him and a female colleague as "the mad dwarf and the nympho schizo".
Sorrell claims Benatti and Tinelli, the founder and chief executive respectively of FullSix Spa, mounted a hate campaign after Benatti was fired.
The case was brought by Sorrell and Daniela Weber, the chief operating officer of WPP Italy, who was referred to in a blog as his "hot lover".
Benatti and Tinelli deny posting the blog or circulating an offensive picture of the pair.
The case continues.