(Someone here will have seen the Pony one so why not include it in the thread? )
Interesting stuff with Prime and Renegades so far, though Renegades beats Prime IMO: it's faster, funnier, tighter, and generally has more life to it. It's like a GI Joe version of Transformers Animated and that's a good thing from my POV. Prime just hasn't quite gelled for me (the fact that the show is admitting the human cast aren't that useful and are just there to be protected is a nice touch, but does knock the guts out of any scene with the kids in).
Megatron and Starscream, on the other hand, are far more menacing villains. Especially Megatron. He's almost too menacing, you wonder why anyone wants to be in his army!
I noted both of those shows spoilers:
end of spoilers
killed off a dude who was "clearly" a main character in the opening episode! It was so abrupt I didn't actually realise Cliffjumper was really dead until the second episode (and then it got worse!), because I'm so used to Transformers fiction cheating on that. Ripcord, being a human, was more obviously meant to be dead. The fact both shows went there is quite impressive though, really upends the audience's expectations and removes the comfort zone fast.