The thing about Singer is this. The approach that he took with the first two movies was absoutely the right way to go in that era. Back then, people weren't ready for the likes of the Avengers, and patterning the look and feel of the X-men movies after more successful flicks like Blade and the Matrix paid off was a smart move.
The problem is that they're still following the same formula nearly 20 years later. They're still pushing characters to the forefront because of star power and whoever's played by somebody. Too many key characters have been underutilized and not allowed to shine enough. They're still running around in black leather jumpsuits and casually killing off whoever they feel like without a thought towards the repercussions. There's no real cohesive game-plan or structure they're ultimately building towards, and the timeline has grown confusing and muddled as a result. They're almost scared to be comicbook movies.
They're competently made, but they're playing it too safe. It's very telling that their most successful outing (Deadpool) was the movie that they had to be dragged kicking and screaming to make. The bar has been raised since the era of the original X-men in 2000. It's time for a new take on the series that's a little closer to the source material. And I'm not even saying they have to go back to Disney
I just want to see the team done justice as a whole, and not just some currently popular celebrity and their entourage.