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No, not with a mentor!
Okay, let's say I take Tilseck and develop him into a pure Rage build.
1. Why would I need machines if there are no Fire Arrows, and the main battle is unlikely to take place in a castle?
2. The skills Stunning Blow, Devil's Blow, and Reinforcements won't be as effective as if I were playing as Krag; it's better to use Chain Lightning instead.
3. I also think Inspiration is not very useful.
In the end, to get 500 Rage at the beginning of the battle, I have to take half of the skills that are... well, not needed. Is it worth it???
If this tactic is effective, it's only with Krag! And even then, it's a big question!
By the way, if I level up a Ballista with Krag, will Reinforcements trigger after each of its three shots?