The Remans made no sense to me. They just spring out of no where but everyone seems to know about them. Are they an offshoot of the Romulans? Were they native to the Romulus and then uprooted? Why is Remus considered the joint homeworld if its just a dumping ground for space-vampires and deadly weapons? (Plus wouldn't the Romulans have learned from Praxis to move that kinda stuff far away from their homeworld?)
It would have been better if they'd been dropped and there was a greater focus on the Romulans, they are a complex enough race to have a political coup on their own.