First i want to apologize if my english is not perfect
I have some suggestion about the crusader. First of all , the thorn build , from a gear and passive point of view.
Each class in the game have at the moment one class restrictive set (Armor of Akkhan for the crusader ) and one set who is non class restrictive but enhance some of the class ability.
Here the list :
Barb : Class Restricted : The Legacy of Raekor Non Class Restrictive : Might of the Earth
Monk : Class Restricted : Raiment of a Thousand Storms Non Class Restrictive : Monkey King's Garb
WD : Class restricted : Helltooth Harness Non class restricted : Raiment of the Jade Harvester
Sorc : Class Restricted : Firebird's Finery Non class restrictive :Vyr's Amazing Arcana
DH : Class Restricted : Embodiment of the Marauder Non class restrictive : The Shadow's Mantle
Crusader : Class Restricted : Armor of Akkhan Non class restrictive : none
Thorn set really have to be a non class restrictive set but he suits really well to the crusader. A change to the set to make him more usefull can be this :
Static affixe who are always on each of the thorn set pieces : Thorn damage with more value than other gear : Head and shoulder : 6k to 12k thorn Glove and bracer : 5k to 8k thorn 2 piece bonus : Iron maiden allows your thorns damage to fully benefit from your strenght. 4 piece bonus is fine at the moment.
This way , you have a set who increase the crusader without being class restrictive. If you look for example at Might of the Earth , it's non class restrictive , but enhance 2 barb ability : Earthquake and Leap. Let's do the same for the crusader !
Next step is change the iron maiden passive. I propose a change : Iron Maiden : Each time you deal Thorn damage , you have a chance to generate 2 Wrath. In addition , all your thorn damage are now increase by 50%
For an other crusader problem , i mean the ressource generation, i propose this change :
Towering shield : Each time you block an attack you gain 2 wrath.
And there is some other passive who are really lackluster , like nephalem majesty ,so change it to : Crusader vow : When you have a Flail and a Crusader shield equipped at the same time , you gain 10% damage and 10% block chance
So that's all for the moment , i just hope someone from Blizzard is going to read this.
So, I'm going to start with Blizzard doesn't take feedback from Diablo Fans forums. I'd reccomend you post on the Beta or PTR suggestions (whatever one you happen to have access to).
As for thorns it's kinda a strange stat. Most of the time you think it's wasted and it likely is and would be better be spent on something like resists or some form of healing secondary stat.
With that said there is a single item (Legendary bracers by the name of Sanguine Vambraces I believe) that changes thorns into an offensive ability. chance to do 1000% of your thorns damage on hit I believe to enemys within (12 or 16?) yards of you.
Now while that forces you to be close to the enemy you will of course be wanting to combo things together with that, such being shoulders Death Witches Mantle (Pretty sure name). Chance on hit to cast Fan of Knives for 200% or so damage to enemys in 12-16ish range when hit, as well as the new effect on Anderials Visage doing ~175% poison damage in a 12yd aoe around you could provide you with a lot of area damage for mobs within your close proximity.