Just another build i've been thinking of. It's essentially the monster build that exchanges kensei II for frenzied berserker I.

In terms of dps you're really just swapping +1 damage from weapon mastery and haste boost IV for 2-12 vicious damage from frenzied berserker and haste boost III.

Everything else is can be matched by the barbarian levels:
+8 strength from power surge = +4 str from rage+ 2 from power rage +2 from frenzied berserker.
+2 damage from greater weapon specialization = +2 PA enhancements.

The main drawback imo is the lower number of action boosts (2 if we include fighter extra action boost) but you do gain damage boost II from the barbarian levels. Relying on rage instead of power surge may also be more problematic in some quests if combat is spread out. 3+ min rages shouldn't be too difficult to achieve so even with 4 rages that's 12+ mins. This should give you more time with +8 strength than power surge would give you, but this time will be clumped together and be more difficult to spread out.

Has anyone tried this? Is it viable?