[2.4] How to smash Heads. Extremely detailed guide about the Facebreaker gloves and builds!

Well you've forgot to tell me what do you consider to be "high level maps" .. anyway...
On the top of the 20% increased life ( which actually you can easily boost up to 40% or even 50% if you feel like more life is what you need at the moment ) you get 12 life per level which is 120 life 10 levels later and that's actually ~400 life multiplied by the % max life from your tree and meginord's girdle .. so 10 points later you'll have at least 700 more life ( if you get only 20% increased life from the tree for those 10 points ).

And again ... facerolling tier 15s at level 72 .. is just simply not a thing in PoE.

And of course that's just 10 levels later ... imagine what say level 90 ( which is easily reachable without even stepping into a high tier level map ) does for you.

After all the highest level content is not designed to be facerolled by a mid level character.

Well the short answer is ... "No, there is no point in doing a crit facebreaker build when it comes to efficiency compared to a classic facebreaker build".

I've talked more about that in many posts before ... you could ... look them up ^^
Pretty much it's not worth it because.
1. The amulet itself has the drawback of not having anything but the build-enabling crit. No life, no flat phys ( remember your amulet is the second biggest flat phys damage contributer ) , no resists ( yes, yet ANOTHER unique item with no resists )
2. The claw thing is basically a "noob-trap", the claw nodes are extremely inefficient when it comes to a facebreaker build of any kind
3. You need to spend points for crit and accuracy related passives, that means that you'll need to sacrifice defenses in order to free up points.
4. In the end you get a build that has the same damage as a more offensive facebreaker RT build, while at the same time it has even less defenses.

Can a rigwald crit facebreaker work well? Sure!
Will it work better than a classic facebreaker? Hell no!

Well 50k is a bit on the low side though it should be enough. 50k with your flasks used and 3 frenzy charges from your blood rage goes up to around 100k dps.
The high end-game, high character level play is all about your survivability as long as you are above the line of the minimum required dps( and 50k infernal blow dps is definitely above that line ).
Again i know it sounds strange but despite all logic crit facebreaker =/= more damage than regular RT facebreaker... at best it results to the same amount of dps while loosing tons of defenses ( shortly explained in my previous post ). For an easy example you could check some of the facebreaker builds on this very sub-forum, some reach well over 350k. The question is do you need more damage instead of defenses or not ... or rather do you want more damage instead of defenses or not.
I've talked about this numerous times in this ( and other thread ) so i won't do it again ( because it results in a huge wall of text ) you could look it up in this thread ( for example my first post on page 306 ).

Atziri has more to do with the build that you are using ( spell/attack that you are using etc. ) and your player skill and experience in doing Atziri and not your gear or the numbers of your dps, life, defenses etc. It's more of a skill-based fight and not as much of a gear-based fight.

Well the gladiator is nice though the champion is the best option in my opinion - good damage, great defenses and FREE fortify, which means good fortify support gem hello something else... simply put champion makes your skill 7 linked.
As for berserker well it's 100% increased and not more physical damage and the difference is huge. Because of that it is nowhere near as good as you might think...
To be honest the marauder classes... are not even close to the duelist classes when it comes to facebreakers.

Elemental damage uncountered? What about resist? What about block ( block blocks all types of attack damage be it physical, elemental or even chaos.) The only problem is spell elemental damage... and it is really a problem with ver few bosses (and for those cases -> saffell ).

So in the end the choice is between champion and gladiator and for me champion is better.