I don't like the idea of a clone army period. The fact that a clone army is basically disposable people solely created to kill is a bit creepy. I guess it would work better for, you know, THE BAD GUYS, but it left a bad taste in my mouth in the PT. Yoda was like, "Ok you sacks of shit, kill the enemies you must. Your deaths, I care not."
Some exhibition mentioned it's supposedly an ancient design, so maybe they didn't figure out lightsaber tech at that point. Though I was sold on the lightsaber in this film. I like how wild and almost demonic it looks. The part where Kylo burns Finn with the hilt, damn now I know why he's got that hilt.