Carbon arrows have some advantages. IMO, at this point in their evolution, they don't have enough advantages to make up for their disadvantages - especially with the bargain basement arrows. My cedar arrows for my longbow are straighter and more consistent than most cheap carbons, and that's the gospel truth.

Aluminum arrows have their disadvantages, but have more than enough advantages to make up for their shortcomings. Rack-attack did a good job of listing the advantages. One great advantage is you can get quality - speaking of straightness and consistent spine and weight - in an aluminum arrow that you'd have to pay near double the price to get in carbon.

TreePhantom says he can't afford to shoot aluminum arrows. I can't afford to buy the carbons that would give me the kind of quality arrow I want. I know when I buy a dozen aluminum arrows that they will all shoot broadheads well. Carbon arrows in the same price range, I'm lucky to get two arrows out of a dozen that will do the same.

My field archery scores with carbon arrows have been a solid 50 points less than my average scores with aluminum arrows.

Aluminum arrows do get bent. But, unlike most people who throw away bent aluminums, I use an arrow straightener and put them right back to factory tolerances or better. I'd rather be straightening aluminums than tossing out a cracked carbon.