The only major problem with the spec atm is it doesn't live up to its name ironically. You have almost zero survivability vs other melee. Don't get me wrong survi has plenty of slows and roots, two freedoms if specced and quite a few ranged attacks. The problem arises when you want to dump your damage into a melee opponent. You need to get bleed rolling, dragonsfire trap, drop a explosive trap which deals a fuckton of damage and put crows cawing. After that you "need" to start pumping mongoose strikes into the opponent until 6 stacks to use your artifact to its full power. Setup alone was 4 globals and actual bursting takes 7.
That is a very long time spent getting hit in the face yourself when your only defensive ( if you want to do damage ) is roar of sacrifice and 1.5sec feign death damage reduction. Having to aspect of the turtle mid bursting is god-awful cause mongoose stacks will fall and you lose all your damage plus your turtleform doesn't even heal you like Bm's or Mm's. Exhil heal is laughable 30% on a 2 min cd, rogues have a similar heal with 30sec cd with same amount restored over 6 seconds i believe. Most ( if not all ) other melee have either flatout xx % damage reduction shield wall or parry/evasion cooldown to let them go apeshit during their burst.
So how to address this. Imo aspect of the turtle "full immunity" ( if you got dotted by a rogue or feral you are done anyways ) & cant attack makes very little sense for a melee spec. It should be changed to flat our parry or evasion from frontal attacks or flat out shield wall. Other thing that came to mind was baking in some sort of damage reduction into your mongoose stacks. "enemy hit by your mongoose bite deals xx% less damage stacks x times."
They could also totaly fix survival tactics which makes your feign death clear magical effects and reduces damage taken by 99% for 1.5 seconds. For your average baddie it pretty much takes 1.5 seconds to re-target you so the reduction seems rather meh for anything but dodging massive damage spikes. I would prefer it to be 30-50% if it lasted 3-5 seconds. Also its about time they remove the stupid "have to be standing still" for feign death to even go off.
Reworking roar of sacrifice could work also. Rather than making you crit immune you would be immune to taking more than 100k damage on a single hit for the duration.
tl;dr: Survival cant survive, feelsblizzardman.