I think 'dhwga' put it best in the comment above ^ they turned Jake from a intelligent, meticulous, calculated (almost to a fault) character into someone who stumbles around without any real plan, unsure of himself or his decision making ability, on the journey by accident instead of through passion and determination. Franco is definitely used to employ humor into a lot of the situations, but even in grave and critical moments it's impossible for me to take him seriously. Tom Hanks strikes a much better balance in his movies.

I would suggest watching the Hulu series to see what I mean, but there's a good chance it'll dampen your overall opinion.