Megatron was the only one I personally think they nailed, but they should have Michael Kane to the VA instead. I remember a lot of the beast war VA are quite good at sounding like transformers even Prime.
Oh, Starscream, they messed everything up for him, I seen him transform in the series, it looks a lot faster and cooler. Colorscheme actually can change the transformer, there are differences with red, blue and so on, for it can be like thundercracker.
Gundams have to worry about hands.