I think the pacing and the dialogue was fine, even if the amateur acting would show itself at times, this was the first time Tabee's actor ever acted, and with that in mind, I think he did a pretty good job.
I'm perfectly fine with the French Hunters knowing about Feral, it would make sense that at some point one of them saw it or was killed by it, we don't see everything the Pred is doing, frankly, this is one of the weakest criticisms I've seen