I dont understand why there is limited choice of weapon types available from challenge vendors, it creates weird situations when you see what someone else can do with his new shiny challenge weapon while you cant becouse there is no weapon that fits your build..... dissapointing.
second thing is the challenge items, why they are so caster based, each of items is build such way that only arcane caster can use them fully, why there are only 2 items that fit to melee class (ring of stalker and belt).
so here is an idea, more weapon types, more item variants with diffrent enchanantment combinations that may suit other classes not only casters, that means few diffrent cloaks, few diffrent bracers, few difrent boots.
limited choice of reward item makes challenges another pointless grind for some builds/classes.