I would agree with you! Book 3 is my favourite!Which is everyone's favourite book? I've almost finished book three on my re-listen and it's definitely by far my favourite, there are so many highlights - Alfie and the 20,000 free woks at the 02, the defrosted chicken kiev and trifle, Marco Auriguez knowing that he is (Boston) Brazillian, Claus Bloch and the goings-on at the Grovesnor, Andy Milston from the TGWU Union, Ken's terrifying basement flat and the duck Me Ken song, the Schweinsteiger siblings and Han's hand, the de Havilland transport plane and most of all the distribution of the orgy's clothing to charity shops throughout Belgium.
On the other hand I find book two pretty meh apart from the cliffhanger about Jim's op. In order I'd go 3 - 4 - 1 - 5 - 2.
the duck me Ken song