Thoughts on Engine Sentai Go-Onger whole series (some spoilers)

I didn't really plan to write about Go-Onger (feel like I don't know enough about sentai to talk about it), but I just got through the whole series like in five days, and found my feelings going up and down quite a lot throughout the course of the series. Yeah, there are spoilers, though I try to avoid mentioning them if I can.

( Positives )

( Not so positives )

( What the latest three blue rangers have in common... )

I haven't seen the net movies (ETA: seen, and nothing really to say) or the Go-On seminar (not sure if it's new or just compilation of those segments--but I think I will watch it in any case), but yeah, did catch just about everything else. (Incidentally, was 2008 the first year to have net movies for sentai and rider? I don't remember any before that, but I might have overlooked them.)