Aside from star lord and the tree, this movie was full of corny...John Bautista (Drax) is possibly one of the worst actors I've seen-he read his script as if it was for a wrestling event.
If you've read the comic, that's how Drax speaks.
I loved that fact that they included some of the more fantastical elements of the Marvel Universe; the Kree, Cosmo, Know Where, etc, while not direct translations, they implement well.
And understand the only reason for this film was to introduce the history of the Infinity Gems, I thought they did this well.