Not BAD, but not good. I guess it was fun to watch, but I sort of wished that for a sequel to Prime, they would've touched on actual topics that would make more sense in a sequel. Instead, they're basically goofing around and chasing down robot animals for the entire show until it ends. I'll admit, there were some enjoyable parts - like meeting old characters from Prime and "new" ones (like Jazz, Windblade, etc), but it's just not that satisfying, especially as a sequel. The last episodes of the show were some of my favorites, and I only wished they picked up the pace to that level BEFORE the show was cancelled. I liked the ending but it didn't feel like an ENDING per se, not like how Transformers Prime did. A lot was left hanging, and many ideas and arcs went nowhere.
This review seems a little negative. In the end, I liked the show. It was enjoyable to watch. I don't regret watch it, and find myself wishing there were new episodes. It just could've been so much better, compared to the other Transformers shows and especially compared to the show that came before it.