First of all it’s important to notice that I do not run with the cookie cutter 0/60/11 build but with 0/55/16 because I believe the added dps/tps from master shape shifter is worth more then whatever you can throw at me from within the feral tree.
Pre-3.1 I used to go with 3/5 R&T as I wanted improved mangle which meant higher threat in my rotation but with the changes to the threat and damage done by faerie fire it is damn good, good enough to always use it whenever it pops off cool down.
This is where we run into a problem as faerie fire is on a 6 second cool down and mangle is on a 4.5 second cool down (if talented), for those who do not see this yet here below is a representation of 18 seconds worth of fighting.
As you can see on GCD 10 there’s a problem that both mangle and faerie fire come off the global cool down at the same time which means that you are losing threat as one of the moves will be not used while ready.
Therefore the threat offered by improved mangle talent is not as high as it was or as most people think it is, I therefore make the case to not take imp mangle so that mangle and faerie fire have the same cooldown which makes for a better rotation as follows.
Which is a rotation that makes perfect sense and frees up 3 points which can be put in 5/5 R&T and 1/1 primal gore which makes more threat then a 3/5 R&T build where 1 out of 3 improved mangle cool downs are wasted.
This would mean that the perfect build for 3.1 Main Tanking in my opinion would still be a 0/55/16 build and the defense of this build will be a seperate post as it goes beyond the scope of this post...
HOT OF THE PRESS!!!
Monedula from Omen of Clarity makes a case that improved mangle is worth it IF you have the Idol of the Corruptor and threat is not an issue, read his reasoning here.