As someone who hasn't really played much of the monk, what exactly is wrong with them? From the little I did play, Exploding Palm & Seven-Sided Strike both seemed really good. Not trying to start a fight; I'm honestly interested to hear what the major problems are since monks seems to get more complaints than any other class.
*Spirit generators don't build enough Spirit for the cost of their spirit spenders nor do they do enough damage. Wave of Light is a WHOPPING 75 spirit to cast, you need to attack like 7 times to be able to use one Wave of Light.
*Lack of variety in good Spirit spender moves. LTK is the best one but it lacks AOE. WoL has good AOE but lacks efficiency or good Legendaries to pair it up with (there is one that makes it free if you kill enemies but that's only good for trash mobs).
*The absolute WORST Set pieces out of all the classes... by a wide margin. It's much better to just use neutral set pieces like Aughild than the Monkey set or the Lightning set.
*They are attached to the Dodge main attribute which sucks because it can't dodge the stuff that actually kills you. While DH can just stay out of range of Plague/Molten pools, Monks have to fight in it which means they have to pick more defensive attributes.
*Because Monks need more resistances than any other class they are pigeonholed into using OWE passive. This also means that they have to have the secondary resistance on gear to compete with other classes in terms of toughness. It's a pain in the ass to try to gear a Monk because of this as they need 4 out of 5 stats to be good on gear compared to other classes which need 3 out of 4.
*Monks severely lack offensive passives. They have decent defensive skills but there are no big damage boosting passives like for example Archery. Plus because they are melee and Dexterity class they need to have AT LEAST 2 defensive passives to survive higher Torments.
*Most of their class specific Legendaries aren't that great either. They have Gyana Na Kushu... and that's about it. You can use the Tailwind rune Daibo for fast Bounty Clears but aside from that there aren't any insane Monk Legendaries like say a Crusader has.
Exploding Palm is what makes them an excellent support class but without it they have trouble in higher Torments solo. If there was a way for another class to use an Exploding Palm like skill (ie a skill that scales off of monster HP and then explodes for that damage) there would be NO REASON to have Monks in your groups for T6.
I think the best Monk build is to stack enough CDR to have permanent Epiphany + Serenity to spam LTKs. Pretty sure they would eventually nerf that because having permanent invulnerability is not something Blizzard is too keen on. Aside from that they have a much time on higher Torments than any other class.