I've tried 4 so far and got tired of all of them pretty fast:
Build: Poison throw barb
Reason: LMB skills (due to stances forced to be on RMB). RSI issues (for me anyway).
(also very clunky that the innate barb Titan Strike skill also has to be on RMB). They need to fix this imo.
Build: Neutraldin (not a new build, but new for me)
Reason: Not fun constantly trying to keep up 7 buffs.
Build: Maelstrom assassin
Reason: Not new for me, played before, few changes so felt like deja vu.
Build: Javazon
Reason: I've not played it before. But I realised quickly that 20% buff to Fairy Ring was not going turn this into a good build.
Can anyone mention any new build that they are really having fun with?