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The biggest failure overall is the gargoyles. Why couldn't they have been made like in part 3?
Firstly, it's their appearance. Secondly, how do they even manage to fly? To even take off from such a massive slab on their feet, they need bigger wings. And if they fly using magic, why bother flapping their wings? Just for show?
Thirdly, it's their death. It's unclear why they die. They just remain as a whole block. Ideally, they should crumble (like golems, at least).
Mages, djinns, and upgraded golems. Seriously, who would go into a bloody battle looking so flamboyant? Well, mages and djinns rely more on ranged combat, but in that form, on the front lines... it's a joke.