Honestly, Cybertron to me is one of those Toy Only lines, like RID. Haven't seen more than maybe two random episodes of Galaxy Force.
But!
The the toy line? One of my all time favourites. It was damn good. It was a step up from the previous UT lines and I think that our Classics/Generations/United would look very, very different if we didn't have the chunky Cybertron aesthetic before.