Well, it was actually the Ritualist's job too. A large portion of his rituals are around melee buffs, although ones that turn him into another creature, or use their power. The touch attacks are part of that. He's using the lifeforce of dead creatures as his weapon, instead of a blade. He also has a fair amount of ranged attacks, although they do take a little while to get going, and a lot of them are cloud or fog based.
The ritual warrior, on the other hand, uses much shorter duration rituals and kills people in combat for his power. Hence finishing strike.
Martyr, on the other hand, is the debuff support role. He's vulnerable enough with burning his own hit points for mana that I didn't want him anywhere near combat, or at least as much as possible.