This movie was disappointing.
Plot Spoiler contained here:
Not just b/c of the stupid physics of dropping a land mass at terminal velocity could NOT cause a mass extinction event, but b/c there was such poor editing done. At least 45 min of the movie was a waste of space and could have been eliminated or used as outtakes. Most of the one-liners were forced or out of place. The love romance between the Hulk and Black Widow had about as much depth and realism to Anakin and Padme in Star Wars.
That said, the sound and visuals were pretty good so if you're looking for some wiz bang effects and mindless action sequences, then this is your movie.