I'm really not too sure why people are being so complimentary about this odd movie. Having said that - I did actually sit through the entire 2 hours and can't say it wasn't entirely un-entertaining.
I think the key problem is that Frank Marshall is not a true director and this is clear in the film - he is an experienced producer, so will have seen a movie made many a time, and will understand what goes into the process. But I think this is quite different to being able to truly direct a movie - the direction was competent, but somehow flat and direction-less. Marshall has more experience as a unit or second director, and this came through, I feel, in the finished product - it appeared to be a group of sets that failed to really have any continuity in its feel or its character.
Fun, watchable, but good? No.