Personally I like carnage, I really do, however I have noticed that I do not get in as much damage as I do when running rage spec. The aoe from smash can give me 5-7k hits easy, to all players within a group. In addition, I have also noticed a huge damage increase to vicious throw. Again I can get 5-7k hits from that as well.
Now that being said, since the release of 2.0 I have always switched over to carnage when playing a game of huttball. The speed boost to your team is so vital, especially if you build up rage by using focus at the beginning of the match, pop predation, and then pop it again once that runs out. I am popping predation as often as I can for the speed boost, and if you play it well, you can have a lot of speed, and with a good team that passes the ball, you can win matches in a matter of minutes.
The downside to carnage when playing other types of warzones is you are not able to do as much damage. Plus you have ton's of stuns to watch out for, which suck, oh and not to mention the bubbles which make your attacks worthless. That being said, for 1v1 if you time it right you can use force scream and get a 6k hit, followed by vicious throw/smash (yes smash) or ravage to finish em off while you have the armor penetration from gore. Sadly this only last 4.5 seconds so you gotta be quick. Maybe bioware will allow this effect to last longer considering force crush for rage spec last 20 seconds. Sure would be nice wouldn't it.
Anyways to sum up how I feel. I am really enjoying the play style. Sadly the numbers just are not as good as what you get with rage, and I have found that you can be a sitting duck at times, even with all the damage reduction, which is very sad. The rotation I have been using is force charge, battering assault, gore, force scream, and then follow up with another finisher. Sadly most people know to watch out for gore, which means you gotta change how you play. Usually you have to attack second, allowing another teammate to take all the stuns from you guy you are about to attack so they can't be used on you. If you do that then carnage is absolutely awesome, but you gotta have a friend who is willing to take all the damage and stuns, like oh say a tank....
Anyways those are my thoughts on the spec, would love to talk more about it. Hopefully someone else will respond to your post after I have. This is a nice topic for a spec that is really fun to play, I would just like to see more time after using gore (of if the time doesn't increase, imaging being immune to stuns while gore is up)