Outside of the advantage of being trained from birth they arent special when compared to other scifi equivalents. They fought a napoleon esque war against a terribly incompetent opponent for 3 years. Compare this with a veteran from the human covenant war (halo) and you have at most a couple months of training paired with 28 years of experience, and imo better experience when you factor in the opponent they fought.
Is this to say that the clones suck? No as ive said before the one advantage that they have is a huge advantage if you were to pit opposing sides right when they got out of training. I love clones always have but it annoys me when people seemingly ignore the fact that clones outside of their training arent special.