... soldier build with martial arts.
For me, it's an Aristocrat with a Zweihander.
While the optimal strategy being to just spam your basic attack is definitely a design flaw, the reason for this problem is that the entire combat/magic/perk system was only ever intended as a placeholder. Which Inno tweaks once a year, rather than redesign it.
To put that another way, when Inno works on this at all - which is almost never anyway - she is putting effort into redesigning a system that - according to her original plan - is going to be scrapped anyway.
It's mind-bogglingly bad use of the little time and effort she puts into this game.