I think Prime was just fine, but lacking in depth. I don't care for G1 references as a prerequisite for my enjoyment of a more modern entry, and what we get in Prime was fun. However, as I said it lacks depth - I think a lot of it can be blamed on the kids ALWAYS getting into trouble, and the small cast of bots.
Now, GI Joe Renegades, THAT was something I enjoyed and would've liked to see continue. It came to a nice natural ending, but I wanted to see where they would have gone from there as the Joe team became official.
Mark <--- Brony!