Another thing with a photorealistic Beast Wars movie is scale. Here are some size comparisons between different animals compared to a human:
human vs gorilla (Optimus Primal)
human vs cheetah (Cheetor)
human vs velociraptor (Dinobot)
human vs wasp (Waspinator)
human and tarantula (Tarantulas)
human vs pteranodon (Terrorsaur)
human vs tyrannosaurus rex (Megatron)
etc.

Imagine all of these animals - in realistic 1:1 scale - fighting each other. And their robot modes would be scaled to the beast modes, so .....