i might try rage tree this week, reading some good stuff about it. im just happy enough with my anni build atm. getting around 250k dmg, 7-8 medals. not the best but always get my 80+ commendations & 1000+valor.
for those struggling with anni marauders, dont go in the middle of big fights, look for those guys out of position and punish them, always keep beserk up, you build rage fairly easy, use sweeping slash to build fury. its essential to v1 ppl. i go biochem, so that + healing with bleeds, obfuscate, cloak of pain, shields, interrupt, cammo u got a lot of useful skill for a v1 combat. if you use theses skills at right moment, you will see that marauders can v1 any class.
i used to go carnage, didnt think it was that bad as ppl complain, had a high burst and it was easier to play but when u get used to anni i dont think u would want to change.