The transformation might be magic, but to fight with it probably isn't int based.
Nope, all Polymorpher skills will be INT-based.
Where are you getting this information? A quote or link would be beneficial. Otherwise it's just speculation.
I'm not really sure what to suggest, but one of the things I never liked too much about the warfare skills is that so many of them seem built around the general idea of being more a berserker/brutish type, than a proper soldier. I've always wished for there to be more warfare abilities or attacks themed around using well practiced techniques and counter attacks, or viciously striking weak points. Granted, part of that seems like it would be resrved for scoundrel in the current system.
I agree with this! Which is why I hope more weapon based skills and talents gets added, in addition to, in my opinion, necessary balance changes to the melee weapons and shields. Do this and I think a melee focused character with warfare skills can be a very rewarding and diverse choice.