Hans Zimmer isn't a bad composer, in fact he's put out some of the most iconic and memorable scores of the last 10 years. But this choice still BAFFLES me. James Horner was a bold pick for the first movie, because he's an iconic and versatile composer who is confident in his own style. Hiring Horner for the first movie didn't just mean we were getting a good score, but that we were getting one with Horner's signature approach.
So for whatever reason he's not coming back. Maybe he didn't want to or was demanding too much money. Anyone's guess really. So it's baffling to me that their response would be to hire a composer who has a defined style that is 180 from Horner's. You go from big, magical orchestra to minimal, loop-based melodies with bludgeoning percussion, loud, aggressive brass, and rock elements patched in? It'd be one thing if Zimmer was on board for the first movie, and it'd be another thing if Horner's approach wasn't as broad and cartoony on the first movie for them to go with Zimmer, but it seems like they're re-inventing their own approach to this character after already re-inventing him from the get-go in ASM 1.