I find this shot neither good nor bad, voted a 5 on it. Like that you included the setting, the city but think the fireworks are pretty weak compared to most in the challenge and composition way too centered + that building with the blue roof in the corner draws my attention.
This is crying out for the "law of thirds" to be applied - re-cropping to place the towerover to the left. The spread of the fireworks would have supported this beautifully. And it could have used just a tiny bit of straightening.
I can't make up my mind whether the ANZ building in the bottom right is a distraction or not. It would be hard to crop it out without losing too many useful elements, though.
Where was this taken from? I can't think of any building from where you could have taken a shot this high. It looks like Nortcote Point in the background, so maybe somewhere around Albert Park?