Journey to One wasn't terrible by any means. By contrary, the first few episodes were quite good. The rushed ending (which came because of the line's early cancellation) is what ruined eveything. If G2 wasn't cancelled so prematurely, Journey to One could have got a proper ending, and could have been remembered more fondly by fans.
Also, on a side note, I think Journey to One came a bit too late. It should have came out at the beginning of the line in 2015 instead of so late in 2016. If that would have happened, I bet the line would have been far more successful.