There's not much to write about this series. This series revived transformers show excitiment after the sh##ty "robots in disguise" series (comics were better) killed it.
It brings back many G1 designs, bring back Bumblebee's voice too (after not speaking for like a decade) and doesn't have much screentime on humans, in fact the entire screentime is used for the Transformers themselves and the emotional conflict. Even Optimus Prime is just like his G1 coounterpart (in a good way). The series has a simple storyline to follow for each season:
Season one - Autobots must find the Allspark before the Decepticons do, while Bee and Windblade try to get former's memories back.
Season two - The Allspark is found, the war between it begins, Starscream takes over.
(Don't know about season three)
Overall, the series are worth few hours to watch and does bring that feel of nostalgia (G1 designs and characteristics) while also having action and emotional balance.
Like I wrote, a Blessing to my Spark.