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.