Just came back from the pre-screening in SF. The SFX are as amazing as everyone's been saying... The story was ok though somewhat convoluted and IMO a little underdeveloped. The character development was the weakest of the MCU films, I didn't get much of a sense of the protagonist or the supporting characters compared to the characters of the other films (Deadpool, Ant Man, etc).
O/A it was entertaining though and nicely paced, the story that was there was interesting. I'd give it a 7/10, the effects are worth the price of admission alone and especially in 3D.