To be honest, story-wise, I think most of the episodes in RiD was boring and it generally lacked a compelling overarching story line. That said, it is still quite entertaining to watch. I loved the way that there are so many combiners in the series and it's the only series where I thought the stock footage of the transformations didn't get old or repetitive.
The latter part of the show improved greatly though, the plot where Megatron corrupts Autobot protoforms to form the Combaticons was great, and I loved how they explained why Scourge looked so similar to Optimus (and to play on that fact in the Fortress Maximus arc too). The first time Optimus combines with Ultra Magnus was amazing (I particularly love the "handshake combination, very unique aspect there) and unexpected. The ending was a bit disappointing in that Fortress Maximus just appears there and does nothing. I was hoping he'll go on a rampage and destroy everything and the Autobots somehow stop him.
"sometimes the things you see might not be real and the things that are real you might not see"