We have two players in our group that I will compare.
1. A dwarf soldier with 4 strenght, using a hand axe
2. A human wizard with 4 intelligence and 4 willpower
The damage potential for the dwarfs troll feller strike is: 4+5+3+4 = 16 damage
The damage potential of the wizard ´using flame blast is: 4+6+1+1+1 = 13 damage
The wizard has a lower damage and on top of that he needs to channel, meaning that unless he takes an extra challenge die he can only do 13 damage every second turn. He can also spend more power, but that is really not worth it because to get 3 extra damage he could just as well canst a new spell for the 6 power it costs.
What's your experience with the wizard and his damage output?
I am thinking about fixing it by making channeling an maneuvre instead of an action, but still the damage output will remain much lower while at the same time having a lower survivability.