I'll be curious to see if Singer gets a second wind after he does 20,000 Leagues. He has made my top 3 favourite X-Men films and 2 of my favourite comic book films in general. It's sad to see him under-perform for the first time.
There are some things he did here which are symptomatic of the franchise's problems overall: ignoring basic continuity, muting side characters and villains, narrow character focus in general, squashing long-term story potential. These are things that happened from the start and are no longer acceptable in this era of comic book movies.
I had hoped the reset in DOFP would change a lot of things for the better, and it is distressing to see old habbits creeping back in already. It's also become clear that Singer's strengths lie in intimate scenes, small scale action and dramatic performances. I love these, but if the franchise continues to move into more epic, outlandish territory, then Singer might not be the man for the job. The large scale action in Apocalypse sucks. No two ways about it.