I would tend to agree with what has been said about carbons.

Cutting from both the nock and point end of the blank shaft is the real secret to getting very consistent carbon arrows.

For the average Joe, and even most of the above average ones, any inconsistency that you might see in a carbon arrow is so low in relation to the normal consistency of most archers, that you will probably not notice the difference.

I shoot carbon arrows for all of my rigs except my indoor spot setup (2613 aluminums). I don't feel that there is any drawback to shooting a good quality carbon arrow. In my experience they last longer and in 99% of the cases, they are either straight or they are broken. Not too much gray area there.