Question for fellow vikings (warrior)

[redfuryau]

I confess I have not played that far into the game, but one thing that makes me apprehensive now is all the probability-based skilled in the Viking Tree. One thing I loved about KB:TL and AP was that other than critical hits, there wasn't that much randomness so you could plan out your strategies with confidence, sorta like chess. Now I see that 5 of the 6 end-skills in the Viking tree are based on the dice roll.

Example: Unit doing 10-15 damage in KB:TL could do min:10 max: 23 (crit trigger).
Now it seems max (theory) would be 30 (crit trigger+absolute rage) * 2 (berserker trigger) * 2 (luck rune trigger with crit/berserker again) = 120 damage! I know this is an insane example but hopefully you'll see the point it's trying to make.

So my question to players who have played a warrior a long way into the game: do these chance-based skills (which you pay a LOT of runes for) trigger enough to be useful in strategizing, or is the chance-based system frustrating?