In terms of what I personally was expecting, only two movies have significantly overperformed, everything else either underperformed or I got right. The two breakout movies, I expected them to break out, just didn't quite expect them to do as well as they have.
Though if we are just talking about what is going to make money for studios, then the summer has been good. Avengers and Ant-Man may have taken big drops or be disappointments from the previous movies, but they are still gonna make tons of money. Hell, even Terminator which supposedly bombed, will still make its money back. Magic Mike and Paper Towns are dropping from their predecessors but they're small-budget studio movies so will still make a lot of profit.
The only proper bomb has been Tomorrowland. Which incidentally I still need to see, hopefully it'll come back to the cinema in a few weeks.