It has problems from a nitpicky standpoint, but substantially less than the first movies poster. Overall I really enjoy the vibrant color scheme, the dynamic composition, and the ominous silhouettes in the background that are clear enough to hint at danger but obscure revealing details.
It is obviously not photorealistic (nor should it be), it's clearly cobbled together in photoshop, and the lighting is particularly off, but that's something that won't matter at all to your casual movie goer. Most would look at this and think, "Cool, another Avengers movie!"
Better?