It's funny to see Teriz propose such a class concept, even though he wasn't that long ago, quite opposed to a warden related class.
I think this concept is fine, and i would play it.
Though it misses some ideas i would bring into such a class, most notably the inclusion of spellbreakers themes, mechanics and styles (1h+shield dps).
But that is bias on my side, and really wanting that magical melee fighter.