I honestly didn't really notice the 'wet-leopard growl' until pointed out on here. Even now it still doesn't bother me, really can't see why people get so worked up over it tbh.
In regards to it not covering the battle as well as ATS, why would it need to? What would be the benefit of seeing the exact same battle in from the other side. Do we need to see Istvaan V from all of the other perspectives? No, not at all, we would gain very little from it. The Burning of Prospero was captured perfectly in ATS and simply doesn't need any more. I always wonder, were people actually hoping for an entire novel dedicated to one battle? Because that wouldn't have dragged at all.....
ATS shows Prospero being destroyed. Prospero Burns shows why it was destroyed and all the events and manipulations that led to it's destruction. It wasn't even close to a let down for me, was exactly what was needed imo.
As Doelago says, I wouldn't listen to the criticism you hear, bolter porn it is not. Good literature, that it is.