I loved the film, even if I can see why it's clearly below X2, DOFP and First Class. But it was in a way the X-Men film I've always wanted to see, with all characters getting their time to showcase their powers.
The first act suffers from the same issues of Game of Thrones: they have dozens of characters, each with their separate storyline and each in a different part of the world, where there's no chance to find any of the other people, so you just spend a great deal of time jumping from each story, which results in the feeling that the story as a whole is not advancing much.
I was not expecting at all that they would re-introduce the Phoenix this early. And at the same time I'm glad they are coherent with their own vision from The Last Stand: the Phoenix is just the hidden powers of Jean, and not an entity from space. Comic fans would have like them to change it for this revision, but it would have been too messy with their own continuity.
In fact, if you haven't seen The Last Stand, hence knowing beforehand that Jean has hidden powers, you would pretty much think this is a very cheap trick from the writers. Even if we do get an introduction with Jean's dream scene.
And talking about continuity, I can't believe they are still messing things up. If everything has continued the same with Weapon X, why was it so important that Mystique and not Stryker took Wolverine out of the water in DOFP?
Also, I don't understand why Singer was saying that something in DOFP made Apocalypse awaken in the 80s. Or was it the introduction of mutants in the 70s, which caused the reappearance of the cult to the first mutant?