You know, I disagree. His voyage into the Expanse was very much like the Odyssey. We even have his words that come back to haunt him: he'll destory the weapon whatever it takes. Ohhh, irony! He realizes exactly what "whatever it takes" means and how expensive it is.
Now it is my turn to disagree

. Unless, of course you mean "Odyssey" simply as a voyage full of adventures. Homer's Odyseey is a classical "nekuia", a long home-coming, and in order to achieve the goal, the hero have to grow up spiritually and be ready to settle down after a life of peril. Archer's voyage would be rather an initiation journey: leaving the home and going into the world (galaxy in this case

). Archer and Skywalker? There is a substantial difference, I insist: Skywalker's goes through tempatation and peril towards the final spiritual victory: the voyage to the light. Archer's journey is descend into (moral) darkness. Darth Vader comes to mind rather than Luke

In order to re-establish the harmony of the world Archer has to sacrifice his inner harmony. A canonical tragedy situation. If it were a work of Shakespeare, Archer would have died in Zero Hour. He SHOULD have died. Mercifully, this is not Shakespeare, but Star Trek so he is kept alive to make us happy in the 4th season.
In season 4, he has to reconcile his two halves: the guy who will do whatever it takes to accomplish success and the naive one who began the journey (Archer in seasons 1 and 2). How much more spiritual can ya get? I think that's incredibly moving. I think in season 4 we see him reconciled (although stupidly) -- he can be both caring and moral as well as someone who accomplishes his task. And he understands his own boundaries. After all, even with Surak's katra prompting him the logical thing to do would be to go visit the Vulcan captial city and deliver the katra, he goes after T'Pol, his friend.
Ok, I have to confess something: I don't like the 4th season. I know most people consider it excellent, but I, personally, was deeply disappointed by it. I have an impression that the producers were so eager to give as many lollipops as possible to the fans of Star Trek canon, that they forgot to follow the characters' development. There is a clumsy (IMO) attempt to deal with Archer's post-Xindi trauma in "Home", but I really do not think a sweet interlude with E.H. would be sufficient to heal his moral wounds. Something he said in that episode was very true, however: he told Erica that she should try to be an explorer (looking for the Graal, yeah) because he was not able to do it anymore. And in fact, in the 4th season Archer is no more an explorer, he deals mainly with nasty problems and threats to the Earth.
As for Vulcan trylogy... I am about to say a heresy, but I do not like it either. The idea to show Spock's planet was great, the idea of Romulans inflitrating Vulcans was exciting, but the plot's logic falls apart and Archer being given katra means turning him into a superhero he is not (I should probably explain it better, I know), or he WAS not.
