ok, so I watched the entirety of it, all 112 episodes, from start to finish, over the break.
Arlen: it gets darker. As in, the enemies are all human psychics who are obsessed with killing us all because of humankind's own sins.
The ending isn't bad either
long and short, it was worth watching, and it's better (at least in my opinion) than most action shows. It has more depth than FIGHT FIGHT FIGHT train harder FIGHT train FIGHT FIGHT.
there's actually motives/personalities to the enemies other than "I'm evil", and there seems to be a little philosophy later on.