I think all the Predators have looked successively worse since the first movie, which is worrying since the original was a rush job. None of the others ever looked as organic and alive again.
Some think it's nitpicky to go on about things like mandibles, but it's the title freakin' character. If it looks off or looks silly or is distractingly bad, it's going to bring the film down. And not just for fans, but the general audience as well. The idea that there are people who go to a movie called Predator (or whatever variation) and don't pay attention to the look of the thing is ... I don't even know what you'd call it.