The key word here is adaption - this show is not the book, nor is it an attempt to represent the book in a methodical translation from page to screen - it's an adaption. That allows for some creative license and rejigging in its retelling of the original story.
For me, this was a successful retelling of a classic story. There was dramatic tension between the three protagonists - who go on the adventure - and the antagonists were suitably nasty and conniving. It seemed clear to me that one of the main themes of this version of the tale was the particular journey of Phileas Fog (David Tennant). His transformation from upper class man of leisure and suspended animation, who doesn't really care for anything anymore beyond his own comforts, into someone who eventually finds a part of himself and can begin to live, to be involved in his life.
This aspect of Fog's transformation plays out against the interesting main story arc of the 'romp' around the world in 80 days - an at times cavalier and hair raising journey that is quite entertaining - requiring some suspension of disbelief to be sure, but what classic heroes journey (within the realms of entertainment) doesn't.
This show is supposed to entertain rather than enlighten - and I think it does that very well.
