John Carter
I heard it wasn't bad, just poorly marketed. I also heard that the story, while entertaining, could seem unbelievably dumb at times, but I was curious to see for myself, knowing the the source material is a century old. These both turned out to be true.
I thought it was a good movie. It started rather strangely, and asked the viewer to absorb a lot of stuff up front that would make more sense later, and that can be dangerous, but once I was able to sort out what the hell was going on, it was pretty cool. There was perhaps too much going on in terms of plot for most audiences. It was sci-fi, and IMO good sci-fi does demand a lot of the viewer, but they threw a lot at you without a lot of explanation or time to absorb it. The result was something that was not light entertainment, but was delivered as though it were. I don't think the filmmakers quite knew what they were doing here, as far as how to present the material.
Obligatory comment about Lynn Collins being hot.