Very good
I love Transformers, and I swear by G1. I reject anything else, than G1, including those horrible Michael Bay movies, however I was interested to see is.
This was very good. The animation style they chose was interesting, and it did work. The transformations weren't overly complicated, and it was animated well.
The voice work was good for the most part. Chris Hemsworth for the most part suited Orion Pax, and he sounded really good as Optimus Prime. Brian Henry did not work at all for D-16/Megatron. His voice did not suit Megatron. Scarlett's voice work for Elita-1 was a stand-out. She did great.
The opening shot of inside Cybertron was glorious to see, and to get so much history of Cybertron and the Transformers was very welcome.
Overall, the story was really good, and the villains worked.
A very enjoyable experience, and will add this to my G1 collection.